Prof. Dr. Martin R. Hofmann

  • Professor/in - Lehrstuhl Photonik und Terahertztechnologie
Hofmann , Martin R.

Adresse

Prof. Dr. Martin Hofmann
Lehrstuhl für Photonik und Terahertztechnologie

Sprechstunden: jederzeit, am besten nach kurzer Absprache

Raum
ID 04/329
Telefon:
(+49)(0)234 / 32 - 22259
Fax:
(+49)(0)234 / 32 - 14167
E-Mail:
martin.hofmann@rub.de
Webseite:
http://www.ptt.rub.de/

Lebenslauf

  • 1985-1991: Studium der Physik an der Philipps-Universität Marburg
  • 1991-1994: Wissenschaftlicher Mitarbeiter in der AG Halbleiterphysik der Philipps-Universität Marburg
  • 1994: Promotion auf dem Gebiet Halbleiterlaser an der Philipps-Universität Marburg
  • 1995: Post-Doc im Rahmen des HumanCapital and Mibility Programms der EU mit Forschungsaufenthalten am University College Cork (Irland), bei der Fondazione Ugo Bordoni (Rom, Italien) und bei Tele Danmark Research (Hoersholm, Dänemark)
  • 1996-2001: Wissenschaftlicher Assistent am Fachbereich Physik der Philipps-Universität Marburg
  • 2000: Habilitation für Experimentalphysik
  • 2001-2007: Leiter der AG Optoelektronische Bauelemente und Werkstoffe (vormals: Werkstoffe der Mikroelektronik) an der RUB
  • seit 2007: Leiter des Lehrstuhls für Photonik und Terahertztechnologie an der RUB

Forschungsschwerpunkte

  • Optische Charakterisierung von Werkstoffen
  • Halbleiterlaser: Charakterisierung, Optimierung und neue Anwendungen
  • Entwicklung von THz-Strahlungsquellen
  • THz-Technologie
  • Optische Messtechnik für biomedizinische Anwendungen

Lehrveranstaltungen

Veröffentlichungen

2017
Tunable Two-Colour Semiconductor Laser for a Compact CW THz Spectroscopy System

Yinghui Hu, Besher Khani, Carsten Brenner, Andreas Stöhr, Martin R. Hofmann - Semiconductor Integrated Optoelectronics (SIOE) Conference in Cardiff University, Cardiff, Wales, UK, 18-20th April (2017)

Generation of Terahertz radiation with monolithically integrated dual mode Distributed Bragg Reflector semiconductor diode laser

Jared Ombiro Gwaro, Carsten Brenner, Bernd Sumpf, Andreas Klehr, Jörg Fricke, Martin R. Hofmann - German Terahertz Conference, March 29-31,(2017).

Common-path holographic objective for conventional photographic camera

Vira R. Besaga, Nils C. Gerhardt, Peter P. Maksimyak, Martin R. Hofmann - Proc. SPIE, Optics + Photonics Conference, San Diego (2017) – accepted –

Femtosecond semiconductor laser system with resonator-internal dispersion adaptation

Rouven H. Pilny, Benjamin Döpke, Jan C. Balzer, Carsten Brenner, Andreas Klehr, Andrea Knigge, Gün­ther Tränkle, Martin R. Hofmann - Optics Letters, Volume 42, Issue 8, pp. 1524-1527 (2017), doi: 10.1364/OL.42.001524

Investigations on polarization oscillation amplitudes in spin-VCSELs

Markus Lindemann, Tobias Pusch, Rainer Michalzik, Nils C. Gerhardt, Martin R. Hofmann - 10122-23, Photonics West Conference, San Francisco (2017)

Investigations on polarization oscillation amplitudes in spin-VCSELs

Markus Lindemann, Tobias Pusch, Rainer Michalzik, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE 10122, 101220O (2017)

Monolithic vertical-cavity surface-emitting laser with thermally tunable birefringence

Tobias Pusch, Eros La Tona, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann , Rainer Michalzik - Appl. Phys. Lett. 110, 151106 (2017); doi:10.1063/1.4980025

Spectral Domain Optical Coherence Tomography for Non-Destructive Testing of Protection Coatings on Metal Substrates

Marcel Lenz, Cristian Mazzon, Christopher Dillmann, Nils C. Gerhardt, Hubert Welp, Michael Prange, Martin R. Hofmann - Appl. Sci. 2017, 7, 364.

Dynamics of the photoacoustic response of single-element PZT transducers to pulse burst excitation

Maxim N. Cher­ka­shin, Carsten Brenner, Widodo Dwi Putro, Benjamin Döpke, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE 10064, Photons Plus Ultrasound: Imaging and Sensing 2017 (March 3, 2017); doi: 10.1117/12.2253051

Linking transducer transfer function with multi-pulse excitation photoacoustic response

Maxim N. Cher­ka­shin, Carsten Brenner, Widodo Dwi Putro, Benjamin Döpke, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE 10139, Medical Imaging 2017: Ultrasonic Imaging and Tomography (March 13, 2017); doi: 10.1117/12.2254577

Backside imaging of a microcontroller with common-path digital holography

Markus Finkeldey, Lena Göring, Falk Schellenberg, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE. 10127, Practical Holography XXXI: Materials and Applications, 1012704. (February 15, 2017) doi: 10.1117/12.2250903

Backside imaging of a microcontroller with common-path digital holography

Markus Finkeldey, Lena Göring, Falk Schellenberg, Nils C. Gerhardt, Martin R. Hofmann - 10127-3, SPIE Photonics West, San Francisco, California, USA (2017)

Lensless digital holographic microscope using in-line configuration and laser diode illumination

Lena Göring, Markus Finkeldey, Adamou Adinda-Ougba, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE. 10127, Practical Holography XXXI: Materials and Applications, 101270V. (February 15, 2017) doi: 10.1117/12.2250927

Multimodal backside imaging of a microcontroller using confocal laser scanning and optical-beam-induced current imaging

Markus Finkeldey, Lena Göring, Falk Schellenberg, Carsten Brenner, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE. 10110, Photonic Instrumentation Engineering IV, 101101F. (February 20, 2017) doi: 10.1117/12.2250912

Spectroscopic optical coherence tomography for ex vivo brain tumor analysis

Marcel Lenz, Robin Krug, Christopher Dillmann, Alexandra Gerling, Nils C. Gerhardt, Hubert Welp, Kirsten Schmieder, Martin R. Hofmann - Proc. SPIE 10054, Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XV, 100540L (February 14, 2017); doi:10.1117/12.2252141.

Spectroscopic optical coherence tomography for ex vivo brain tumor analysis

Marcel Lenz, Robin Krug, Christopher Dillmann, Alexandra Gerling, Nils C. Gerhardt, Hubert Welp, Kirsten Schmieder, Martin R. Hofmann - SPIE 10054-19, SPIE Photonics West, San Francisco, California, USA (2017)

Applications for Optical Components in THz Systems

Andreas Stöhr, Vitaly Rymanov, Besher Khani, Yinghui Hu, Martin R. Hofmann - Optical Fiber Communication Conference (OFC), Los Angeles, California, USA (2017) -invited paper-

Two-Color Laser for THz Generation with High Speed Photodiodes

Yinghui Hu, Besher Khani, Carsten Brenner, Vitaly Rymanov, Andreas Stöhr, Martin R. Hofmann - German Terahertz Conference, Bochum, Germany (2017)

Terahertz frequency generation with monolithically integrated dual wavelength Distributed Bragg Reflector semiconductor laser diode

Jared Ombiro Gwaro, Carsten Brenner, Bernd Sumpf, Andreas Klehr, Jörg Fricke, Martin R. Hofmann - IET optoelectronics special issue, DOI: 10.1049/iet-opt.2016.0054 , Print ISSN 1751-8768, Online ISSN 1751-8776

2016
Local binary patterns for differentiation of brain tissue types inoptical coherence tomography images

Marcel Lenz, Robin Krug, Christopher Dillmann, Nils C. Gerhardt, Hubert Welp, Kirsten Schmieder, Martin R. Hofmann - BMT Basel (2016)

Frequency tuning of polarization oscillations in spin-lasers

Markus Lindemann, Nils C. Gerhardt, Tobias Pusch, Rainer Michalzik, Martin R. Hofmann - 9931-153, Optics + Photonics Conference, San Diego (2016)

Frequency tuning of polarization oscillations in spin-lasers

Markus Lindemann, Nils C. Gerhardt, Tobias Pusch, Rainer Michalzik, Martin R. Hofmann - Proc. SPIE 9931, 993149

High-frequency operation of spin vertical-cavity surface-emitting lasers: towards 100 GHz

Nils C. Gerhardt, Markus Lindemann, Tobias Pusch, Rainer Michalzik, Martin R. Hofmann - 9931-11, Optics + Photonics Conference, San Diego (2016) -Invited Talk-

High-frequency operation of spin vertical-cavity surface-emitting lasers: towards 100 GHz

Nils C. Gerhardt, Markus Lindemann, Tobias Pusch, Rainer Michalzik, Martin R. Hofmann - Proc. SPIE 9931, 99310C (2016)

Interaction of phase and amplitude shaping in an external cavity semiconductor laser

Rouven H. Pilny, Benjamin Döpke, Jan C. Balzer, Carsten Brenner, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin R. Hofmann - SPIE Photonics West (OPTO), San Francisco (2016)

Interaction of phase and amplitude shaping in an external cavity semiconductor laser

Rouven H. Pilny, Benjamin Döpke, Jan C. Balzer, Carsten Brenner, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin R. Hofmann - Proc. SPIE 9767; DOI: 10.1117/12.2212906

Timing jitter performance of mode-locked external cavity multi-quantum-well semiconductor lasers

Benjamin Döpke, Rouven H. Pilny, Heiko Horstkemper, Carsten Brenner, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin R. Hofmann - Proc. SPIE 9767; DOI: 10.1117/12.2213042

Impact of resonator-internal pulse shaping in mode-locked diode lasers

Rouven H. Pilny, Benjamin Döpke, Carsten Brenner, Thomas Prziwarka, Andreas Klehr, Hans Wenzel, Andrea Knigge, Jörg Hader, Martin R. Hofmann - Nonlinear Dynamics in Semiconductor Lasers, WIAS Berlin (2016)

Common-path digital holography microscopy of buried semiconductor specimen

Markus Finkeldey, Lena Göring, Nils C. Gerhardt, Martin R. Hofmann - Imaging and Applied Optics 2016, OSA Technical Digest (online), paper JW4A.40

Birefringence tuning of VCSELs

Tobias Pusch, Marwan Bou Sanayeh, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann , Rainer Michalzik - SPIE Photonics Europe, Brussels, Belgium (2016)

Birefringence tuning of VCSELs

Tobias Pusch, Marwan Bou Sanayeh, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann , Rainer Michalzik - Proc. SPIE 9892, 989222 (2016); doi:10.1117/12.2228091

Birefringent vertical cavity surface-emitting lasers: toward high speed spin-lasers

Nils C. Gerhardt, Markus Lindemann, Tobias Pusch, Rainer Michalzik, Martin R. Hofmann - Proc. SPIE 9892, 989206 (2016); doi:10.1117/12.2229356

Frequency tuning of polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers

Markus Lindemann, Tobias Pusch, Rainer Michalzik, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE 9892, 989224 (April 28, 2016); doi:10.1117/12.2229358

Dynamics of double-pulse photoacoustic excitation

Maxim N. Cher­ka­shin, Carsten Brenner, Lena Göring, Benjamin Döpke, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE 9708, Photons Plus Ultrasound: Imaging and Sensing 2016, 97084C (March 15, 2016); doi:10.1117/12.2213476

Large Laser Spots and Fault Sensitivity Analysis

Falk Schellenberg, Markus Finkeldey, Nils C. Gerhardt, Martin R. Hofmann , Amir Moradi, Chris­tof Paar - IEEE International Symposium on Hardware Oriented Security and Trust, HOST 2016, McLean, VA, USA, May 3-5, 2016 (best student-pa­per award).

Terahertz frequency generation with monolithically integrated dual wavelength Distributed Bragg Reflector semiconductor laser diode

Jared Ombiro Gwaro, Carsten Brenner, Bernd Sumpf, Andreas Klehr, Jörg Fricke, Martin R. Hofmann - Semiconductor Integrated Optoelectronics (SIOE) conference in Cardiff University, UK 5-7th April (2016)

Ex vivo brain tumor analysis using spectroscopic optical coherence tomography

Marcel Lenz, Robin Krug, Hubert Welp, Kirsten Schmieder, Martin R. Hofmann - SPIE 9697-121, SPIE Photonics West, San Francisco, California, USA (2016)

Common-path depth-filtered digital holography for high resolution imaging of buried semiconductor structures

Markus Finkeldey, Falk Schellenberg, Nils C. Gerhardt, Chris­tof Paar, Martin R. Hofmann - 9771-16, SPIE Photonics West, San Francisco, California, USA (2016)

Terahertz difference frequency generation by a monolithic integrated dual mode Distributed Bragg Reflector semiconductor diode laser

Jared Ombiro Gwaro, Carsten Brenner, Bernd Sumpf, Andreas Klehr, Jörg Fricke , Martin R. Hofmann - 7th International Workshop on Terahertz Technology and Applications Workshop, Kaiserslautern 15-16th March, (2016)

Terahertz wave generation from dual wavelength monolithic integrated Distributed Bragg Reflector semiconductor laser diode

Jared Ombiro Gwaro, Carsten Brenner, Bernd Sumpf, Andreas Klehr, Jörg Fricke, Martin R. Hofmann - Germany microwave conference, GeMiC 2016 , March 14–16, 2016, Bochum, Germany

Ex vivo brain tumor analysis using spectroscopic optical coherence tomography

Marcel Lenz, Robin Krug, Hubert Welp, Kirsten Schmieder, Martin R. Hofmann - Proc. SPIE 9697, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XX, 96973D (March 8, 2016); doi: 10.1117/12.2214704

Common-path depth-filtered digital holography for high resolution imaging of buried semiconductor structures

Markus Finkeldey, Falk Schellenberg, Nils C. Gerhardt, Chris­tof Paar, Martin R. Hofmann - Proc. SPIE 9771, Practical Holography XXX: Materials and Applications, 97710G (7 March 2016); doi: 10.1117/12.2212454

Birefringent vertical-cavity surface-emitting lasers: toward high-speed spin-lasers

Nils C. Gerhardt, Markus Lindemann, T. Pusch, R. Michalzik, Martin R. Hofmann - 9892-5, SPIE Photonics Europe, Brussels, Belgium (2016) – invited -

Frequency tuning of polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers

Markus Lindemann, T. Pusch, R. Michalzik, Nils C. Gerhardt, Martin R. Hofmann - 9892-76, SPIE Photonics Europe, Brussels, Belgium (2016)

Frequency tuning of polarization oscillations: Toward high-speed spin-lasers

Markus Lindemann, T. Pusch, R. Michalzik, Nils C. Gerhardt, Martin R. Hofmann - Appl. Phys. Lett., 108, 042404 (2016)

Influence of birefringence splitting on ultrafast polarization oscillations in VCSELs

Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann , T. Pusch, R. Michalzik - Proc. SPIE 9766, 97660L (2016), doi:10.1117/12.2212413

Influence of birefringence splitting on ultrafast polarization oscillations in VCSELs

Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann , T. Pusch, R. Michalzik - 9766-20, SPIE Photonics West, San Francisco, California, USA (2016)

Recognition of pharmaceuticals with compact Mini-Raman-spectrometer and automized pattern recognition algorithms

Hendrik Jähme, Giuseppe Di Florio, Valeria Conti Nibali, Cemal Esen, Andreas Ostendorf, Markus Grafen, Erich Henke, Jens Soetebier, Carsten Brenner, Martina Havenith-Newen, Martin R. Hofmann - Proc. SPIE 98992M doi:10.1117/12.2228070

Recognition of pharmaceuticals with Raman-spectrometer and automated pattern recognition algorithms

Hendrik Jähme, Giuseppe Di Florio, Valeria Conti Nibali, Cemal Esen, Andreas Ostendorf, Markus Grafen, Erich Henke, Jens Soetebier, Carsten Brenner, Martina Havenith-Newen, Martin R. Hofmann - SPIE Photonics Europe, Brussels, Belgium, 9899-98 (2016)

2015
Intracavity phase and amplitude shaping of a passively mode-locked semiconductor laser

Rouven H. Pilny, Benjamin Döpke, Carsten Brenner, Martin R. Hofmann - Semiconductor and Integrated Optoelectronics, Cardiff (2015)

Spectral broadening of mode-locked semiconductor lasers by resonator-internal pulse shaping

Benjamin Döpke, Rouven H. Pilny, Carsten Brenner, Jan C. Balzer, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin R. Hofmann - CLEO Europe in München (2015)

Vertical-cavity surface-emitting lasers with birefringence splitting above 250 GHz

T. Pusch, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann , R. Michalzik - Electron. Lett. 51, 1600 (2015)

An ex vivo investigation of different brain tumors using Optical Coherence Tomography

Marcel Lenz, Robin Krug, Kirsten Schmieder, Martin R. Hofmann - 49th DGBMT Annual Conference Lübeck 2015

Compact low-cost lensless digital holographic microscope for topographic measurements of microstructures in reflection geometry

Adamou Adinda-Ougba, B. Kabir, Nektarios Koukourakis, F. Mitschker, Nils C. Gerhardt, Martin R. Hofmann - SPIE Optical Systems Design, Jena, Germany (2015)

Compact low-cost lensless digital holographic microscope for topographic measurements of microstructures in reflection geometry

Adamou Adinda-Ougba, B. Kabir, Nektarios Koukourakis, F. Mitschker, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE 9628, Optical Systems Design 2015: Optical Fabrication, Testing, and Metrology V, 962818 (24 September 2015); doi: 10.1117/12.2191073

Simple concept for a wide-field lensless digital holographic microscope using a laser diode

Adamou Adinda-Ougba, Nektarios Koukourakis, Nils C. Gerhardt, Martin R. Hofmann - 49th DGBMT annual conference, Lübeck 2015

Simple concept for a wide-field lensless digital holographic microscope using a laser diode

Adamou Adinda-Ougba, Nektarios Koukourakis, Nils C. Gerhardt, Martin R. Hofmann - DE GRUYTER, Current Directions in Biomedical Engineering, Band 1, Heft 1, Seiten 261–264, ISSN (Online) 2364-5504, DOI: 10.1515/cdbme-2015-0065, September 2015

Laser-diode-based photoacoustic setup to analyze Grüneisen relaxation-effect induced signal enhancement

Maxim N. Cher­ka­shin, Carsten Brenner, Lena Göring, Benjamin Döpke, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE 9539, Opto-Acoustic Methods and Applications in Biophotonics II, 95390M (Munich, 2015); doi:10.1117/12.2183957

Controlled switching and frequency tuning of polarization oscillations in vertical-cavity surface-emitting lasers

Markus Lindemann, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , Tobias Pusch, Rainer Michalzik - Proc. SPIE 9551, Spintronics VIII, 95512Z (2015)

Controlled switching and frequency tuning of polarization oscillations in vertical-cavity surface-emitting lasers

Markus Lindemann, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , Tobias Pusch, Rainer Michalzik - SPIE Optics + Photonics, San Diego, California, USA (2015)

Towards high frequency operation of polarization oscillations in spin vertical-cavity surface-emitting lasers

Markus Lindemann, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , Tobias Pusch, Rainer Michalzik - Proc. SPIE 9551, Spintronics VIII, 95512O (2015) (Invited Paper)

Towards high frequency operation of polarization oscillations in spin vertical-cavity surface-emitting lasers

Markus Lindemann, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , Tobias Pusch, Rainer Michalzik - SPIE Optics + Photonics, San Diego, California, USA (2015) –invited-

On the Complexity Reduction of Laser Fault Injection Campaigns using OBIC Measurements

Falk Schellenberg, Markus Finkeldey, Bastian Richter, Maximilian Schäpers, Nils C. Gerhardt, Martin R. Hofmann , Chris­tof Paar - Fault Diagnosis and Tolerance in Cryptography - FDTC 2015, Saint Malo, France, September 13, 2015.

Diode laser systems for applications in metrology and biomedical imaging

Martin R. Hofmann - Women in Optics - The Castle Meeting, Rauischholzhausen, Germany (August 2015)

Dreidimensionale Einzelschussholographie

Michael Breede, Martin R. Hofmann - DE 102006051868.3-51, erteilt am 6.8.2015

Optimization of a mode-locked diode laser by manipulation of intracavity dispersion and absorption with an evolutionary algorithm

Rouven H. Pilny, Benjamin Döpke, Carsten Brenner, Jan C. Balzer, Martin R. Hofmann - München, CLEO Europe, 2015

Optische Kohärenztomographie für biomedizinische Anwendungen

Marcel Lenz, Robin Krug, Ralf Stroop, Kirsten Schmieder, Martin R. Hofmann - IEEE Workshop 2015- Medizinische Messtechnik, Mülheim (2015)

Photoacoustic Imaging with Laser Diodes

Maxim N. Cher­ka­shin, Martin R. Hofmann - IEEE Workshop 2015- Medizinische Messtechnik, Mülheim (2015)

Spectral domain optical coherence tomography for ex vivo brain tumor analysis

Marcel Lenz, Robin Krug, Volker Jaedicke, Ralf Stroop, Kirsten Schmieder, Martin R. Hofmann - SPIE Op­ti­cal Me­tro­lo­gy, Mu­nich, Ger­ma­ny (2015)

Spectral domain optical coherence tomography for ex vivo brain tumor analysis

Marcel Lenz, Robin Krug , Volker Jaedicke, Ralf Stroop , Kirsten Schmieder, Martin R. Hofmann - Proc. SPIE 9541, Optical Coherence Imaging Techniques and Imaging in Scattering Media, 95411D München (2015); doi:10.1117/12.2183614

Increasing the birefringence of VCSELs beyond 250 GHz

Pusch, T., Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann , Michalzik, R. - Conference on Lasers and Electro-Optics Europe, CLEO/Europe 2015, paper CB-2.2., Munich, German, 2015

Tuning the Frequency of Polarization Oscillations in Spin VCSELs by Mechanical Strain Induction in GHz-Range

Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann , Tobias Pusch, Rainer Michalzik - Conference on Lasers and Electro-Optics Europe, CLEO/Europe 2015, paper: CB-2.1, München

Quantitative phase imaging by wide field lensless digital holographic microscope

Adamou Adinda-Ougba, Nektarios Koukourakis, Aissam Essaidi, Nils C. Gerhardt, Martin R. Hofmann - SPIE Optical Metrology, Munich, Germany (2015)

Quantitative phase imaging by wide field lensless digital holographic microscope

Adamou Adinda-Ougba, Nektarios Koukourakis, Aissam Essaidi, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE 9529, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials II, 952903 (June 22, 2015),doi:10.1117/12.2184471

Intracavity Loss and Dispersion Managed Mode-Locked Diode Laser

Jan C. Balzer, Benjamin Döpke, Rouven H. Pilny, Carsten Brenner, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin R. Hofmann - CLEO , San Jose, USA (2015)

Passively Mode-Locked Diode Laser With Optimized Dispersion Management

Jan C. Balzer, Rouven H. Pilny, Benjamin Döpke, Klehr, A., Erbert, G., Tränkle, G., Carsten Brenner, Martin R. Hofmann - IEEE STQE, Volume 21, Issue 6, 1101008 (2015); doi: 10.1109/JSTQE.2015.2418225

Phase and amplitude calibration of dual-mask spatial light modulator for high-resolution femtosecond pulse shaping

Benjamin Döpke, Jan C. Balzer, Martin R. Hofmann - Electron. Lett. - Vol. 51 Issue 8 pp. 642-644.

Self-optimizing femtosecond semiconductor laser

Benjamin Döpke, Rouven H. Pilny, Carsten Brenner, Andreas Klehr, Götz Erbert, Günther Tränkle, Jan C. Balzer, Martin R. Hofmann - Opt. Express, Vol. 23, Issue 8, pp. 9710-9716 (2015); doi: 10.1364/OE.23.009710

Ultrashort pulse generation with semiconductor lasers using intracavity phase- and amplitude pulse shaping

Benjamin Döpke, Jan C. Balzer, Rouven H. Pilny, Carsten Brenner, Andreas Klehr, Götz Erbert, Gün­ther Tränkle, Martin R. Hofmann - SPIE Photonics West (OPTO), San Francisco (2015) – #9382-13

Ultrashort pulse generation with semiconductor lasers using intracavity phase- and amplitude pulse shaping

Benjamin Döpke, Jan C. Balzer, Rouven H. Pilny, Carsten Brenner, Andreas Klehr, Götz Erbert, Gün­ther Tränkle, Martin R. Hofmann - SPIE Photonics West (OPTO), San Francisco (2015)

Controlling the frequency of ultra-fast polarization oscillations in spin-VCSELs

Markus Lindemann, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , Tobias Pusch, Rainer Michalzik - DPG Frühjahrstagung Berlin, (15.-20.03.2015)

Ultrafast polarization dynamics with controlled polarization oscillations in vertical-cavity surface-emitting lasers

Markus Lindemann, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , Tobias Pusch, Rainer Michalzik - Proc. SPIE 9381, Vertical-Cavity Surface-Emitting Lasers XIX, 93810I (March 4, 2015); doi: 10.1117/12.2076920

Ultrafast polarization dynamics with controlled polarization oscillations in vertical-cavity surface-emitting lasers

Markus Lindemann, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , Tobias Pusch, Rainer Michalzik - Photonics West, San Francisco, (7.-12.02.2015)

2014
Development and evaluation of a device for simultaneous uniaxial compression and optical imaging of cartilage samples in vitro

Marian Steinert, Kratz, Marita, Volker Jaedicke, Martin R. Hofmann , Jones, David B. - Review of Scientific Instruments, Vol. 85, Issue 10, Article Number 104301 (2014)

Effects of axial scanning in confocal microscopy employing adaptive optics (CAL)

Nektarios Koukourakis, Markus Finkeldey, M. Stürmer, Nils C. Gerhardt, U. Wallrabe, Martin R. Hofmann , J.W. Czarske, A. Fischer - Optical Micro- and Nanometrology V, 91320P (2014)

Multiwavelength phase unwrapping and aberration correction using depth filtered digital holography

Volker Jaedicke, Sebastian Goebel, Nektarios Koukourakis, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - Optics Letters, 39 (14), 4160-4163 (2014)

Polarization dynamics in spin-polarized vertical-cavity surface-emitting lasers

Nils C. Gerhardt, Henning Höpfner, Markus Lindemann, Martin R. Hofmann - Proc. SPIE, 9167, Spintronics VII, 916703 (2014)

Spin-controlled ultrafast vertical-cavity surface-emitting lasers

Henning Höpfner, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE, 9134, Semiconductor Lasers and Laser Dynamics VI, 913408 (2014)

Employing electrically tunable lenses in confocal microscopy for axial scanning

Nektarios Koukourakis, Markus Finkeldey, M. Stürmer, C. Leithold, Nils C. Gerhardt, U. Wallrabe, Martin R. Hofmann , J.W. Czarske, A. Fischer - 23th Congress of the International Commission for Optics: Enlightening the future, Santiago de Compostela, Spain (2014)

Polarization dynamics in spin-polarized vertical-cavity surface-emitting lasers

Nils C. Gerhardt, Henning Höpfner, Markus Lindemann, Martin R. Hofmann - SPIE Optics + Photonics, San Diego, California, USA (2014) –invited-

Effects of axial scanning in confocal microscopy employing adaptive optics (CAL)

Nektarios Koukourakis, Markus Finkeldey, M. Stürmer, Nils C. Gerhardt, U. Wallrabe, Martin R. Hofmann , J.W. Czarske, A. Fischer - Photonics Europe, Brussel, Belgium (2014)

Spin-controlled ultrafast vertical-cavity surface-emitting lasers

Henning Höpfner, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann - SPIE Photonics Europe, Brussel, Belgium (2014)

Coherent switching of polarization oscillations in vertical-cavity surface-emitting lasers

Henning Höpfner, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann - SPIE Photonics West, San Francisco, California, USA (2014)

Performance comparison of different metrics for spectroscopic optical coherence tomography

Volker Jaedicke, Semih Agcaer , F.E. Robles, N. Steinert, D. Jones, Sebastian Goebel, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - SPIE Photonics West, San Francisco, California, USA (2014)

Mode-locked semiconductor laser system with intracavity spatial light modulator for linear and nonlinear dispersion management

Jan C. Balzer, Benjamin Döpke, Carsten Brenner, A. Klehr, G. Erbert, G. Tränkle, Martin R. Hofmann - Opt. Express 22, 18093-18100 (2014)

Controlled switching of ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers

Markus Lindemann, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann - SIOE, Cardiff, UK

Polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers controlled by multiple excitation pulses

Henning Höpfner, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann - DPG Frühjahrstagung, Dresden, Germany (2014)

Performance comparison of different metrics for spectroscopic optical coherence tomography

Volker Jaedicke, Semih Agcaer , Francisco E. Robles, Marian Steinert, David Jones, Sebastian Goebel, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - Proc. SPIE 8952, Biomedical Applications of Light Scattering VIII, 89520Z (March 4, 2014); doi:10.1117/12.2038891

Axial scanning in confocal microscopy employing adaptive lenses (CAL)

Nektarios Koukourakis, Markus Finkeldey, Moritz Stürmer, Christoph Leithold, Nils C. Gerhardt, Martin R. Hofmann , Ulrike Wallrabe, Jürgen W. Czarske, Andreas Fischer - OPTICS EXPRESS 6025; DOI:10.1364/OE.22.006025

Coherent Switching of Polarization Oscillations in Vertical-Cavity Surface-Emitting Lasers

Henning Höpfner, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann - Proceedings of SPIE 9001, 90010G (2014)

Femtosecond semiconductor laser system with arbitrary intracavity phase and amplitude manipulation

Jan C. Balzer, Benjamin Döpke, A. Klehr, G. Erbert, G Tränkle, Martin R. Hofmann - SPIE OPTO, 90020D-90020D-6 (2014)

In-situ calibration of spatial light modulators in femtosecond pulse shapers

Benjamin Döpke, Jan C. Balzer, Martin R. Hofmann - SPIE OPTO, 90040D-90040D-6 (2014)

Femtosecond semiconductor laser system with arbitrary intracavity phase and amplitude manipulation

Jan C. Balzer, Benjamin Döpke, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin R. Hofmann - SPIE Photonics West (OPTO), San Francisco (2014) – #9002-12

In-situ calibration of spatial light modulators in femtosecond pulse shapers

Benjamin Döpke, Jan C. Balzer, Martin R. Hofmann - SPIE Photonics West (OPTO), San Francisco (2014) – # 9004-11

Controlled switching of ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers

Henning Höpfner, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann - Applied Physics Letters 104 (2), 022409 (2014)

2013
High power femtosecond diode laser systems

Jan C. Balzer, Benjamin Döpke, Martin R. Hofmann , Andreas Klehr, Thomas Hoffmann, Götz Erbert, Günther Tränkle - Photonik I/2013 pp. 66-69

Comparison of different metrics for analysis and visualization in spectroscopic optical coherence tomography

Volker Jaedicke, Semih Agcaer , Francisco E. Robles, Marian Steinert, David Jones, Sebastian Goebel, Nils C. Gerhardt, Hubert Welp, Martin R. Hofmann - Biomedical Optics Express, Vol. 4, Issue 12, pp. 2945-2961 (2013)

Quantum Dot Spintronics: Fundamentals and Applications

A. Ludwig, B. Sothmann, Henning Höpfner, Nils C. Gerhardt, J. Nannen, T. Kümmell, J. König, Martin R. Hofmann , G. Bacher, A.D. Wieck - in H. Zabel and M. Farle (eds.), Magnetic Nanostructures, Springer Tracts in Modern Physics 246, 235 (2013)

Spin injection, transport, and relaxation in spin light-emitting diodes: magnetic field effects

Henning Höpfner, Carola Fritsche, Arne Ludwig, Astrid Ludwig, Frank Stromberg, Heiko Wende, Werner Keune, Dirk Reuter, Andreas D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - Proceeding of SPIE 8813, 43 (2013) (Invited Paper)

Ultrafast spin-polarized vertical-cavity surface-emitting lasers

Nils C. Gerhardt, Henning Höpfner, Markus Lindemann, Mingyuan Li, Hendrik Jähme, Thorsten Ackemann, Martin R. Hofmann - Proceedings of SPIE 8813, 80 (2013) (Invited Paper)

Spin relaxation in spin light-emitting diodes: effect of magnetic field and temperature

Henning Höpfner, Carola Fritsche, A. Ludwig, A. Ludwig, F. Stromberg, H. Wende, W. Keune, D. Reuter, A.D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - Proc. SPIE, 8623, 86230A (2013)

Spin injection, transport, and relaxation in spin-light emitting diodes: magnetic field effects

Henning Höpfner, Carola Fritsche, A. Ludwig, A. Ludwig, F. Stromberg, H. Wende, W. Keune, D. Reuter, A.D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - SPIE Optics + Photonics, San Diego, California, USA (2013) –invited-

Ultrafast spin-polarized vertical-cavity surface-emitting lasers

Nils C. Gerhardt, Henning Höpfner, Markus Lindemann, Mingyuan Li, Hendrik Jähme, T. Ackemann, Martin R. Hofmann - SPIE Optics + Photonics, San Diego, California, USA (2013) –invited-

Quantitative phase analysis through scattering media by depth-filtered digital holography

Sebastian Goebel, Volker Jaedicke, Nektarios Koukourakis, Helge Wiethoff, Adamou Adinda-Ougba, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - SPIE Photonics West, San Francisco, California, USA (2013)

Spectroscopic optical coherence tomography with graphics processing unit based analysis of three dimensional data sets

Volker Jaedicke, Semih Agcaer , Sebastian Goebel, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - SPIE Photonics West, San Francisco, California, USA (2013)

Spin relaxation in spin light-emitting diodes: effect of magnetic field and temperature

Henning Höpfner, Carola Fritsche, A. Ludwig, A. Ludwig, F. Stromberg, H. Wende, W. Keune, D. Reuter, A.D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - SPIE Photonics West, San Francisco, California, USA (2013)

High peak power pulses from dispersion optimised modelocked semiconductor laser

Jan C. Balzer, Tobias Schlauch, A. Klehr, G. Erbert, G. Tränkle, Martin R. Hofmann - Electronics Letters,49,13,838-839,2013,IET Digital Library

Contrast enhancement for scattering samples in spectroscopic optical coherence tomography using pattern recognition

Volker Jaedicke, Sebastian Goebel, Semih Agcaer , Nils C. Gerhardt, Hubert Welp, Martin R. Hofmann - ECBO 2013, Munich, Germany

Spin relaxation length in quantum dot spin LEDs

Henning Höpfner, Carola Fritsche, Ludwig, A., Ludwig, A., Stromberg, F., Wende, H., Keune, W., Reuter, D., Wieck, A. D., Nils C. Gerhardt, Martin R. Hofmann - Physica Status Solidi (C) 10 (9), 1214-1217 (2013)

Mode-Locked semiconductor laser with controllable intracavity dispersion and absorption

Jan C. Balzer, Benjamin Döpke, A. Klehr, G. Erbert, G. Tränkle, Martin R. Hofmann - The European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference (CLEO/Europe-IQEC)

Non-exponential photoluminescence transients in GaNAsP lattice matched to (001) silicon substrate

Nils C. Gerhardt, Nektarios Koukourakis, Markus Finkeldey, Martin R. Hofmann , M. Zimprich, K. Volz, W. Stolz, K. Jandieri, F. Gebhard, S. Baranovskii , B. Kunert - DPG Frühjahrstagung, Regensburg, Germany (2013)

Optical gain and lasing in GaNAsP/BGa(As)P heterostructures grown on (001) silicon substrate

Markus Finkeldey, Nektarios Koukourakis, Nils C. Gerhardt, Martin R. Hofmann , M. Zimprich, K. Volz, W. Stolz, B. Kunert - DPG Frühjahrstagung, Regensburg, Germany (2013)

Spin injection and spin relaxation: Magnetic field effects

Henning Höpfner, Carola Fritsche, A. Ludwig, A. Ludwig, F. Stromberg, H. Wende, W. Keune, D. Reuter, A.D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - DPG Frühjahrstagung, Regensburg, Germany (2013)

Intracavity Cubic Phase Manipulation of Mode-Locked Semiconductor Lasers

Benjamin Döpke, Jan C. Balzer, A. Klehr, G. Erbert, G. Tränkle, Martin R. Hofmann - SIOE, Cardiff, UK

Leistungsstarke Femtosekunden-Diodenlasersysteme

Jan C. Balzer, Benjamin Döpke, Martin R. Hofmann , Andreas Klehr, Thomas Hoffmann, Götz Erbert, Günther Tränkle - Photonik 2/2013 pp. 38-41

Semiconductor diode lasers for THz technology

Martin R. Hofmann - Herausgeber: Nordrhein-Westfälische Akademie der Wissenschaften und der Künste, IW37 Ferdinand Schöningh, Paderborn 2013

Quantitative phase analysis through scattering media by depth-filtered digital holography

Sebastian Goebel, Volker Jaedicke, Nektarios Koukourakis, Helge Wiethoff, Adamou Adinda-Ougba, Nils C. Gerhardt, Hubert Welp , Martin R. Hofmann - Proc. SPIE 8589, Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XX, 85891J (February 22, 2013); doi:10.1117/12.2001159

Spectroscopic optical coherence tomography with graphics processing unit based analysis of three dimensional data sets

Volker Jaedicke, Semih Agcaer , Sebastian Goebel, Nils C. Gerhardt, Hubert Welp, Martin R. Hofmann - Proc. SPIE 8592, Biomedical Applications of Light Scattering VII, 859215 (February 21, 2013); doi:10.1117/12.2000464

Non-exponential photoluminescence transients in Ga(NAsP) lattice matched to (001) silicon substrate

K. Jandieri, B. Kunert, S. Liebich, M. Zimprich, K. Volz, W. Stolz, F. Gebhard, S.D. Baranovskii, Nektarios Koukourakis, Nils C. Gerhardt, Martin R. Hofmann - Phys. Rev. B, Vol.87, No.3, 035303 (2013)

2012
Photoacoustic Blood Oxygenation Imaging Based on Semiconductor Lasers

Claus-Stefan Friedrich, Martin P. Mienkina, Carsten Brenner, Nils C. Gerhardt, Manfred Jörger, Andreas Strauß, Martin F. Beckmann, Georg Schmitz, Martin R. Hofmann - Photonics and Optoelectronics (P&O) 1, 48 (2012)

Terahertz Picosecond Pulse Photomixing with Colliding Pulse Modelocked Lasers

Carsten Brenner, Heiko Horstkemper, I. Cámara Mayorga, A. Klehr, G. Erbert, Martin R. Hofmann - ESLW 2012, Brüssel, Belgien

"Erratum: "Room temperature spin relaxation length in spin light-emitting diodes"

Henning Höpfner, Mingyuan Li, Nils C. Gerhardt, Martin R. Hofmann , A. Ludwig, A. Ebbing, D. Reuter, A.D. Wieck, F. Stromberg, W. Keune, H. Wende - [Appl. Phys. Lett. 99, 051102 (2011)]”, Appl. Phys. Lett. 100 (26), 269902 (2012)

Analysis of birefringence controlled ultrafast polarization oscillations in spin vertical-cavity surface-emitting lasers

Mingyuan Li, T. Ackemann, Nils C. Gerhardt, Martin R. Hofmann - EOS Annual Meeting, Aberdeen, UK (2012)

Spin-Controlled Vertical-Cavity Surface-Emitting Lasers

Nils C. Gerhardt, Martin R. Hofmann - Advances of Optical Technologies, 2012, 268949 (2012)

Time-resolved photoluminescence and optical gain in Ga(NAsP) heterostructures pseudomorphically grown on silicon

Nils C. Gerhardt, Nektarios Koukourakis, Max Klimasch, Martin R. Hofmann , S. Liebich, M. Zimprich, K. Volz, W. Stolz, B. Kunert - E-MRS Spring Meeting, Strasbourg, France (2012)

Magnetic field dependence of the spin relaxation length in spin light-emitting diodes

Henning Höpfner, Carola Fritsche, Arne Ludwig, Astrid Ludwig, Frank Stromberg, Heiko Wende, Werner Keune, Dirk Reuter, Andreas D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - Applied Physics Letters 101 (11), 112402 (2012)

Spin relaxation length in quantum dot spin LEDs

Henning Höpfner, Carola Fritsche, Arne Ludwig, Astrid Ludwig, Frank Stromberg, Heiko Wende, Werner Keune, Dirk Reuter, Andreas D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - NOEKS11, Stuttgart, September 2012

Signal Processing for Spectroscopic Optical Coherence Tomography

Volker Jaedicke, Sebastian Goebel, Semih Agcaer , Christoph Kasseck, Nils C. Gerhardt, H. Welp , Martin R. Hofmann - VII International Workshop on Biosignal Interpretation, Como, Italy (2012)

Neue optische Verfahren für die biomedizinische Bildgebung

Martin R. Hofmann - 5. NRW Nanokonferenz, Dortmund, September 2012 (invited)

Depth-filtered digital holography

Nektarios Koukourakis, Volker Jaedicke, Adamou Adinda-Ougba, Sebastian Goebel, Helge Wiethoff, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann - Optics Express Vol. *20*, Iss. 20, 22636--22648 (2012)

Multispectral photoacoustic coded excitation using pseudorandom codes

Martin F. Beckmann, Claus-Stefan Friedrich, Martin P. Mienkina, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Proc. SPIE, 8223, 82231E (2012)

Signal Processing for Spectroscopic Optical Coherence Tomography

Sebastian Goebel, Semih Agcaer , Volker Jaedicke, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - Biomedizinische Technik. Biomedical engineering, vol. 57, p. 4258, Aug. 2012

System development for Spectroscopic Optical Coherence Tomography

Volker Jaedicke, Semih Agcaer , Sebastian Goebel, Helge Wiethoff, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - Biomedizinische Technik. Biomedical engineering, vol. 57, p. 4245, Aug. 2012

Signal Processing in Spectroscopic Optical Coherence Tomography

Sebastian Goebel, Volker Jaedicke, Semih Agcaer , Nils C. Gerhardt, H. Welp, Martin R. Hofmann - Biomedical Engineering, Jena, Germany (2012)

System development for Spectroscopic Optical Coherence Tomography

Volker Jaedicke, Semih Agcaer , Sebastian Goebel, Helge Wiethoff, Nils C. Gerhardt, H. Welp , Martin R. Hofmann - Biomedical Engineering, Jena, Germany (2012)

Ultrafast spin-induced polarization oscillations in vertical-cavity surface-emitting lasers

Nils C. Gerhardt, Mingyuan Li, Hendrik Jähme, Henning Höpfner, Thorsten Ackemann, Martin R. Hofmann - VCSEL Day 2012, Berlin, June 2012

Spin relaxation dynamics in spin-LEDs

Henning Höpfner, Carola Fritsche, A. Ludwig, A. Ludwig, F. Stromberg, H. Wende, W. Keune, D. Reuter, A.D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - DPG Frühjahrstagung, Berlin, Germany (2012)

Temperature dependence of the spin relaxation length in spin quantum dot LEDs

Carola Fritsche, Henning Höpfner, A. Ludwig, A. Ludwig, F. Stromberg, H. Wende, W. Keune, D. Reuter, A.D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - DPG Frühjahrstagung, Berlin, Germany (2012)

Time-resolved photoluminescence and optical gain in Ga(NAsP) pseudomorphically grown on silicon

Nektarios Koukourakis, Max Klimasch, Nils C. Gerhardt, Martin R. Hofmann , S. Liebich, D. Trusheim, M. Zimprich, K. Volz, W. Stolz, B. Kunert - DPG Frühjahrstagung, Berlin, Germany (2012)

High room-temperature optical gain in Ga(NAsP)/Si heterostructures

Nektarios Koukourakis, Christina Bückers, Dominic A. Funke, Nils C. Gerhardt, Sven Liebich, Sangam Chatterjee, Christoph Lange, Martin Zimprich, Kertsin Volz, Wolfgang Stolz, B. Kunert, S.W. Koch, Martin R. Hofmann - Applied Phys. Letters *100, *092107 (2012)

Photoluminescence and optical gain of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate

Nektarios Koukourakis, Max Klimasch, Dominic A. Funke, Nils C. Gerhardt, Martin R. Hofmann , Sven Liebich, Martin Zimprich, Bernardette Kunert, Kerstin Volz, Wolfgang Stolz - SPIE Photonics West (OPTO), San Francisco (2012), [82660R]

Photoluminescence and optical gain of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate

Nektarios Koukourakis, Max Klimasch, Dominic A. Funke, Nils C. Gerhardt, Martin R. Hofmann , Sven Liebich, Martin Zimprich, Bernardette Kunert, Kerstin Volz, Wolfgang Stolz - SPIE Proceeding 82660R (2012)

Room temperature spin relaxation in quantum dot based spin-optoelectronic devices

Henning Höpfner, Mingyuan Li, Arne Ludwig, Astrid Ludwig, Frank Stromberg, Heiko Wende, Werner Keune, Dirk Reuter, Andreas D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - SPIE Photonics West 2012, Ultrafast Phenomena and Nanophotonics XVI, 8260-09, San Francisco, USA

Room temperature spin relaxation in quantum dot based spin-optoelectronic devices

Henning Höpfner, Mingyuan Li, Arne Ludwig, Astrid Ludwig, Frank Stromberg, Heiko Wende, Werner Keune, Dirk Reuter, Andreas D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - Proceedings of SPIE, 8260, 82600A (2012) DOI: 10.1117/12.907821

All semiconductor high power fs laser system with variable repetition rate

Jan C. Balzer, Tobias Schlauch, A. Klehr, G. Erbert, Martin R. Hofmann - Proc. SPIE 8277, 827713 (2012)

All semiconductor high power fs laser system with variable repetition rate

Jan C. Balzer, Tobias Schlauch, Thomas Hoffmann, Andreas Klehr, Goetz Erbert, Martin R. Hofmann - SPIE Photonics West (OPTO), San Francisco (2012) – #8277-39

Multispectral photoacoustic coded excitation using pseudorandom codes

Martin F. Beckmann, Claus-Stefan Friedrich, Martin P. Mienkina, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Proc SPIE 8223, 2012, pp 82231E-1 - 82231E-8 doi:10.1117/12.907427

2011
Modelocked semiconductor laser system with pulse picking for variable repetition rate

Jan C. Balzer, Tobias Schlauch, Th. Hoffmann, A. Klehr, G. Erbert, Martin R. Hofmann - Electron. Lett. -- 8 December 2011 -- Volume 47, Issue 25, p.1387–1388

Ultrafast spin-induced polarization oscillations with tunable lifetime in vertical-cavity surface-emitting lasers

Nils C. Gerhardt, Mingyuan Li, Hendrik Jähme, Henning Höpfner, T. Ackemann, Martin R. Hofmann - Appl. Phys. Lett. 99, 151107 (2011)

High-throughput characterization of film thickness in thin film materials libraries by digital holographic microscopy

Ryan Yiu Wai Lai, Michael Krause, Alan Savan, Sigurd Thienhaus, Nektarios Koukourakis, Martin R. Hofmann , Alfred Ludwig - Sci. Technol. Adv. Mater. 12 (2011) 054201 (6pp)

Photorefractive two-wave mixing for image amplification in digital holography

Nektarios Koukourakis, Tarek Abdelwahab, Mingyuan Li, Henning Höpfner, Ryan Yiu Wai Lai, Emmanouil Darakis, Carsten Brenner, Nils C. Gerhardt, Martin R. Hofmann - OPTICS EXPRESS Vol. 19, No. 22 22004 (2011)

Time-resolved photoluminescence and optical gain of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate

Nils C. Gerhardt, Nektarios Koukourakis, Max Klimasch, Dominic Funke, Martin R. Hofmann , B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, K. Volz, W. Stolz - Transparent Optical Networks (ICTON), 2011 13th International Conference on, pp.1-4, (2011)

Photoacoustic Coded Excitation using Periodically Perfect Sequences

Martin F. Beckmann, Martin P. Mienkina, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - IEEE Int. Ultrasonics Symposium 2011, Orlando, FL, 2011, pp. 1179 - 1182 doi:10.1109/ULTSYM.2011.0290

High modal gain in Ga(NAsP)/(BGa)((As)P) heterostructures grown lattice matched on (001) silicon

Nektarios Koukourakis, Dominic Funke, Nils C. Gerhardt, Martin R. Hofmann , S. Liebich, C. Bückers, S. Zinnkann, M. Zimprich, A. Beyers, S. Chatterjee, S.W. Koch, B. Kunert, K. Volz , W. Stolz - Proc. SPIE, 7939, 793927 (2011)

Quantitative photoacoustic blood oxygenation measurement of whole porcine blood samples using a multi-wavelength semiconductor laser system

Claus-Stefan Friedrich, Martin P. Mienkina, Carsten Brenner, Nils C. Gerhardt, M. Jörger, A. Strauß, Martin F. Beckmann, Georg Schmitz, Martin R. Hofmann - Proc. SPIE-OSA Biomedical Optics 8088, 808814-1 (2011)

Spin induced gigahertz polarization oscillations in vertical surface-emitting laser devices

Mingyuan Li, Hendrik Jähme, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , T. Ackemann - Proc. SPIE, 7952, 79520B (2011)

Modal gain and time-resolved photoluminescence of Ga(NAsP) heterostructures pseudo-morphically grown on Silicon (001) substrate

Nektarios Koukourakis, Dominic Funke, Nils C. Gerhardt, Martin R. Hofmann , B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, C. Bückers, S.W. Koch, K. Volz, W. Stolz - OSA, CLEO/IQEC, Baltimore, Maryland, USA (2011)

Time-resolved photoluminescence and optical gain of Ga(NAsP) heterostructures pseudomorphically grown on Silicon (001) substrate

Nils C. Gerhardt, Nektarios Koukourakis, Max Klimasch, Dominic Funke, Martin R. Hofmann , B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, K. Volz, W. Stolz - 13th International Conference on Transparent Optical Networks (ICTON), Stockholm, Sweden (2011)

Room temperature spin relaxation length in spin light-emitting diodes

Henning Höpfner, Mingyuan Li, Nils C. Gerhardt, Martin R. Hofmann , Arne Ludwig, Astrid Ebbing, Dirk Reuter, Andreas D. Wieck, Frank Stromberg, Heiko Wende, Werner Keune - Appl. Phys. Lett. 99 (5) 051102 (2011)

Semiconductor diode lasers for terahertz technology

Carsten Brenner, Claus-Stefan Friedrich, Martin R. Hofmann - Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 32, No. 11, pp 1253-1266 (2011)

Optical system analysis and optimization in spectroscopic optical coherence tomography

Volker Jaedicke, Helge Wiethoff, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - Biomedical Engineering, Freiburg, Germany (2011)

Colliding pulse mode-locked lasers as light sources for single-shot holography

Doris Grosse, Nektarios Koukourakis, Nils C. Gerhardt, Tobias Schlauch, Jan C. Balzer, Klehr, A., Erbert, G., Tränkele, G., Martin R. Hofmann - In International Conference on Applications of Optics and Photonics (pp. 80010O-80010O). International Society for Optics and Photonics.

Single-shot holography with colliding pulse mode-locked lasers as light source

Doris Grosse, Nektarios Koukourakis, Nils C. Gerhardt, Tobias Schlauch, Jan C. Balzer, Klehr, A., Erbert, G. , Tränkele, G., Martin R. Hofmann - Quantum Electronics Conference & Lasers and Electro-Optics (CLEO/IQEC/PACIFIC RIM), Sydney, Australia, 2011.

Colliding pulse mode-locked lasers as light sources for single-shot holography

Doris Grosse, Nektarios Koukourakis, Tobias Schlauch, Jan C. Balzer, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin R. Hofmann - International Conference on Applications of Optics and Photonics (AOP), Braga, Protugal, 2011.

Single-shot holography with colliding pulse mode-locked lasers as light source

Doris Grosse, Nektarios Koukourakis, Nils C. Gerhardt, Tobias Schlauch, Jan C. Balzer, A. Klehr, G. Erbert, G. Tränkle, Martin R. Hofmann - In Quantum Electronics Conference & Lasers and Electro-Optics (CLEO/IQEC/PACIFIC RIM), 2011 (pp. 1693-1695). IEEE.

Colliding pulse mode-locked lasers as light sources for single-shot holography

Doris Grosse, Nektarios Koukourakis, Tobias Schlauch, Jan C. Balzer, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin R. Hofmann - Semiconductor and Integrated Optoelectronics (SIOE) conference, Cardiff, Wales, United Kingdom, 2011

Fastly tunable External-Cavity Diode-Lasers Controlled by Electro-Absorption Modulators

Hendrik Jähme, M. Bülters, D. Jäger, Martin R. Hofmann - CLEO Europe München

Spectroscopic Optical Coherence Tomography for substance differentiation

Volker Jaedicke, Helge Wiethoff, Christoph Kasseck, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - International Symposium on Optical Coherence Tomography. Ilmenau, Germany (2011)

Shoe box all semiconductor high power femtosecond laser system

Jan C. Balzer, Tobias Schlauch, Martin R. Hofmann , A. Klehr, G. Erbert - CLEO/Europe-EQEC 2011

Birefringence and spin controlled ultrafast polarization oscillations in vertical-cavity surface-emitting lasers

Mingyuan Li, Hendrik Jähme, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , T. Ackemann - CLEO Europe 2011, Munich, Germany

Quantitative photoacoustic blood oxygenation measurement of whole porcine blood samples using a multi-wavelength semiconductor laser system

Claus-Stefan Friedrich, Martin P. Mienkina, Carsten Brenner, Nils C. Gerhardt, Manfred Jörger, Andreas Strauß, Martin F. Beckmann, Georg Schmitz, Martin R. Hofmann - SPIE / OSA European Conferences on Biomedical Optics 2011, 8088-40, Munich, Germany, 2011

Electrical spin injection inInAs quantum dots at room temperature and adjustment of the emission wavelength for spintronic applications

A. Ludwig, R. Roescu, A.K. Rai, K. Trunov, F. Stromberg, Mingyuan Li, Henning Höpfner, A. Ebbing, Nils C. Gerhardt, Martin R. Hofmann , H. Wende, W. Keune, D. Reuter, A.D. Wieck - Journal of Crystal Growth, Volume 323, Issue 1, 15 May 2011, Pages 376-379

Perpendicular spin injection and polarization features in InAs quantum dots

A. Ludwig, Henning Höpfner, F. Stromberg, A. Ebbing, A. Warland, Mingyuan Li, Nils C. Gerhardt, D. Reuter, O. Petracic, Martin R. Hofmann , H. Wende, W. Keune , A.D. Wieck - DPG Frühjahrstagung, Dresden, Germany (2011)

Remanent spin injection and spin relaxation in quantum dot light-emitting diodes

Henning Höpfner, Mingyuan Li, A. Ludwig, A. Ebbing, F. Stromberg, H. Wende, W. Keune, D. Reuter, A.D. Wieck, Nils C. Gerhardt, Martin R. Hofmann - DPG Frühjahrstagung, Dresden, Germany (2011)

Time-resolved photoluminescence in GaNAsP heterostructures grown on silicon

Nektarios Koukourakis, Dominic Funke, Nils C. Gerhardt, Martin R. Hofmann , B. Kunert, Sven Liebich, S. Zinnkann, M. Zimprich, K. Volz, W. Stolz - DPG Frühjahrstagung, Dresden, Germany (2011)

Spectroscopic optical coherence tomography for substance identification

Volker Jaedicke, Helge Wiethoff, Semih Agcaer , Christoph Kasseck, Nils C. Gerhardt, Hubert Welp, Martin R. Hofmann - Proc. SPIE 8091, 80911U (2011), DOI:10.1117/12.889651

Spectroscopic optical coherence tomography for substance identification

Volker Jaedicke, Helge Wiethoff, Semih Agcaer , Christoph Kasseck, Nils C. Gerhardt, Hubert Welp, Martin R. Hofmann - ECBO 2011, Munich, Germany

Optical gain in GaNAsP heterostructures pseudomorphically grown on silicon

Nektarios Koukourakis, Dominic Funke, Nils C. Gerhardt, Martin R. Hofmann , B. Kunert, S. Liebich, C. Bückers, S. Zinnkann, M. Zimprich, K. Volz, S.W. Koch , W. Stolz - DPG Frühjahrstagung, Dresden, Germany (2011)

Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices

Mingyuan Li, Hendrik Jähme, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , T. Ackemann - SPIE Photonics West 2011, San Francisco, USA

Semiconductor Laser Based THz Technology

Carsten Brenner, Martin R. Hofmann - CLEO, Baltimore, USA - invited

Passively mode-locked two section laser diode with intracavity dispersion control

Tobias Schlauch, Jan C. Balzer, Martin R. Hofmann , A. Klehr, G. Erbert, G. Tränkle - SPIE Photonics West (OPTO), [7937-27] S.79370S-1-79370S-7, (2011)

Passively mode-locked two section laser diode with intracavity dispersion control

Tobias Schlauch, Jan C. Balzer, Martin R. Hofmann , A. Klehr, G. Erbert, G. Tränkle - SPIE Photonics West (OPTO), San Francisco (2011)

High modal gain in Ga(NAsP)/(BGa)((As)P) heterostructures grown lattice-matched on (001) silicon

Nektarios Koukourakis, Dominic A. Funke, Nils C. Gerhardt, Martin R. Hofmann , S. Liebich, S. Zinnkann, M. Zimprich, A. Beyer, S. Chatterjee, C. Bückers, S. W. Koch, K. Volz, W. Stolz, B. Kunert - SPIE Photonics West (OPTO), San Francisco (2011), [7939-79]

2010
Substance Identification in Spectroscopic Optical Coherence Tomograhpy Using Pattern Recognition

Volker Jaedicke, Christoph Kasseck, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - in Frontiers in Optics, OSA Technical Digest (CD) (Optical Society of America, 2010), paper FTuY2

Spectral pattern classification in optical coherence tomography

H. Welp, Volker Jaedicke, Christoph Kasseck, Nils C. Gerhardt, Martin R. Hofmann - 55th IWK 2010, Ilmenau, Germany

Femtosecond passively modelocked diode laser with intracavity dispersion management

Tobias Schlauch, Jan C. Balzer, A. Klehr, G. Erbert, G. Tränkle, Martin R. Hofmann - Opt. Express 18, 24316-24324

Compact diode laser based system for continuous wave and quasi time domain THz spectroscopy

Carsten Brenner, Martin R. Hofmann , M. Scheller, M. K. Shakfa, M. Koch, I. Camara Mayorga, A. Klehr, G. Erbert, G. Tränkle - Opt. Lett. Vol. 35, Iss. 23, pp. 3859-3861

Spectral pattern classification in optical coherence tomography

H. Welp, Volker Jaedicke, Christoph Kasseck, Nils C. Gerhardt, Martin R. Hofmann - Proc. 55th IWK, 737-543 (2010)

Birefringence controlled room-temperature picosecond spin dynamics close to the threshold of vertical-cavity surface-emitting laser devices

Mingyuan Li, Hendrik Jähme, Henning Höpfner, Nils C. Gerhardt, Martin R. Hofmann , T. Ackemann - Appl. Phys. Lett. 97, 191114

Gigahertz Circular Polarization Oscillations in Spin-Polarized Vertical-Cavity Surface-Emitting Lasers

Nils C. Gerhardt, Mingyuan Li, Hendrik Jähme, Martin R. Hofmann , T. Ackemann - NOEKS 2010, Paderborn, Germany

Laser gain in dilute nitride semiconductor quantum well systems – a microscopic analysis

C. Bückers, S.W. Koch, J. Hader, J.V. Moloney, B. Kunert, S. Liebich, K. Volz, W. Stolz, Nektarios Koukourakis, Nils C. Gerhardt, Martin R. Hofmann - ICOOPMA, Budapest, Hungary

Intracavity dispersion control of a passively modelocked semiconductor laser in an external Fourier transform cavity

Jan C. Balzer, Tobias Schlauch, Martin R. Hofmann , A. Klehr, G. Ebert - EPS-QEOD Europhoton, Hamburg, Germany

Monospectral Photoacoustic Imaging using Legendre Sequences

Martin F. Beckmann, Martin P. Mienkina, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Proc IEEE In­ter­na­tio­nal Ul­tra­so­nics Sym­po­si­um, 2010, pp. 386 - 389 doi:10.1109/ULTSYM.2010.5935648

Optical gain in Ga(NAsP)/(BGa)((As)P) heterostructures pseudomorphically grown on Si(001) substrate

Nils C. Gerhardt, Nektarios Koukourakis, Dominic A. Funke, Martin R. Hofmann , S. Liebich, S. Zinnkann, M. Zimprich, S. Chatterjee, K. Volz, W. Stolz - E-MRS Spring Meeting, Strasbourg, France

Properties of Spin.Optoelectronic-Devices

Nils C. Gerhardt, Mingyuan Li, Henning Höpfner, Stephan Hövel, Carsten Brenner, Martin R. Hofmann , A. Ludwig, F.-Y. Lo, D. Reuter, A. Wieck, A. Ebbing, K. Westerholt, H. Zabel, E. Schuster, F. Stromberg, H. Wende, W. Keune, T. Ackemann - Tutorial, Workshop on New Materials – New Functionalities, Marburg, Germany – Invited

Substance identification by depth resolved spectroscopic pattern reconstruction in frequency domain optical coherence tomography

Christoph Kasseck, Volker Jaedicke, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - Optics Communications (2010) (Volume 283, Issue 23, 1 December 2010, Pages 4816-4822)

Monospectral Photoacoustic Imaging using Legendre Sequences

Martin F. Beckmann, Martin P. Mienkina, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann - 2010 IEEE Ultrasonics Symposium (IUS) , San Diego, CA, USA, 2010

Photorefractive Two-Wave Mixing for Image Amplification in Digital Holography

Nektarios Koukourakis, Nils C. Gerhardt, Martin R. Hofmann , Ryan Yiu Wai Lai - OSA Conference paper FThBB5

Spectroscopic image analysis with pattern recognition in frequency domain optical coherence tomography

Volker Jaedicke, Christoph Kasseck, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - OSA Biomedical Optics Conference 2010, Miami, Florida, USA

Substance identification in spectroscopic optical coherence tomograhpy using pattern recognition

Volker Jaedicke, Christoph Kasseck, Nils C. Gerhardt, Hubert Welp, Martin R. Hofmann - Frontiers in Optics, Rochester, NY, USA

Modal Gain analysis of GaNAsP Heterostructures on Silicon

Nektarios Koukourakis, Dominic A. Funke, Nils C. Gerhardt, Martin R. Hofmann , Bernardette Kunert, Sven Liebich, S. Zinnkann, M. Zimprich, A. Beyer, S. Chatterjee, C. Bückers, S. W. Koch, K. Volz, W. Stolz - OSA conference paper JWA56 (2010)

Integrity of micro-hotplates during high-temperature operation monitored by digital holographic microscopy

Ryan Yiu Wai Lai, Nektarios Koukourakis, Nils C. Gerhardt, Martin R. Hofmann , R. Meyer, S. Hamann, M. Ehmann, K. Hackl, E. Darakis, A. Ludwig - IEEE/ASME Journal of Microelectromechanical Systems 4, 1-5, Vol. 19, No. 5, p. 1175

Epitaxial Growth and Interfacial Magnetism of Spin Aligner for Remanent Spin Injection: [Fe/Tb]n/Fe/MgO/GaAs-LED as a Prototype System

E. Schuster, R. A. Brand, F. Stromberg, F.-Y. Lo, D. Reuter, A. D. Wieck, Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , H. Wende, W. Keune - J. Appl. Phys, 108, 063902

Comparison of optical coherence tomography, micro computed tomography and histology at a three-dimensionally imaged trabecular bone sample

Christoph Kasseck, Marita Kratz, Antonia Torcasio, Nils C. Gerhardt, G. Harry van Lenthe, Thilo Gambichler, Klaus Hoffmann, David B. Jones, Martin R. Hofmann - Journal of Biomedical Optics, 15(4), 046019

New concepts for continuous wave and quasi time domain THz systems

Carsten Brenner, Martin R. Hofmann - EOSAM, Paris, France

Spectroscopic Image Analysis with Pattern Recognition in Frequency Domain Optical Coherence Tomography

Volker Jaedicke, Christoph Kasseck, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - in Biomedical Optics, OSA Technical Digest (CD) (Optical Society of America, 2010), paper BSuD8

Electrical Spin injection in InAs Quantum Dots from a Ferromagnetic Contact in Remanence at Room Temperature and Adjustment of the Emission Wavelength for Spintronic Applications

A. Ludwig, R. Roescu, A.K. Rai, K. Trunov, Mingyuan Li, Henning Höpfner, F. Stromberg, A. Ebbing, Nils C. Gerhardt, Martin R. Hofmann , H. Wende, D. Reuter, A.D. Wieck - The 16th International Conference on MBE, Berlin (2010)

Cost-effective THz spectroscopy with continuous-wave laser sources

Martin R. Hofmann , M. Scheller, Carsten Brenner, K. Baaske, M. Koch - EUCAP 2010, Barcelona, Spain, April (invited)

Depth resolved substance identification using pattern recognition in spectroscopic frequency domain optical coherence tomography

Volker Jaedicke, Christoph Kasseck, Nils C. Gerhardt, Martin R. Hofmann - Jahrestagung der DGBMT und 3-Länder-Tagung D-A-CH Rostock, Germany

Modal Gain analysis of GaNAsP Heterostructures on Silicon

Nektarios Koukourakis, Dominic A. Funke, Nils C. Gerhardt, Martin R. Hofmann , Bernardette Kunert, Sven Liebich, S. Zinnkann, M. Zimprich, A. Beyer, S. Chatterjee, C. Bückers, S. W. Koch, K. Volz, W. Stolz - OSA Frontiers in Optics, Rochester

Photorefractive Two-Wave Mixing for Image Amplification in Digital Holography

Nektarios Koukourakis, Nils C. Gerhardt, Martin R. Hofmann , Ryan Yiu Wai Lai - OSA Frontiers in Optics, Rochester

Compact High-Power Ho:YAG MOPA in-Band Pumped by Laser Diode Stacks at 1.9 micron

Samir Lamrini, Martin R. Hofmann , K. Scholle, P. Koopmann, P. Fuhrberg - In Proceedings of EPS-QEOD Europhoton Conference 2010, # WeC5

High-Power Ho:YAG Laser in-Band Pumped by Laser Diodes at 1.9 µm and Wavelength-Stabilized by a Volume Bragg Grating

Samir Lamrini, P. Koopmann, K. Scholle, P. Fuhrberg, Martin R. Hofmann - In Proceedings of Advanced Solid State Photonics 2010, # AMB13 (2010)

Diode laser based THZ homodyne system for cw and quasi time domain spectroscopy

Carsten Brenner, Martin R. Hofmann , M. Scheller, M. K. Shakfa, M. Koch, A. Klehr, G. Erbert - Laser Optics Berlin, Berlin, Germany

Frequency domain optical coherence tomography with subsequent depth resolved spectroscopic image analysis

Christoph Kasseck, Volker Jaedicke, Nils C. Gerhardt, Hubert Welp, Martin R. Hofmann - SPIE Photonics West (BIOS), San Francisco, CA, USA

Frequency domain optical coherence tomography with subsequent depth resolved spectroscopic image analysis

Christoph Kasseck, Volker Jaedicke, Nils C. Gerhardt, H. Welp, Martin R. Hofmann - Proc. SPIE 7554, 75542T (2010), DOI:10.1117/12.840029

Lasing and gain characteristics in Ga(NAsP) heterostructures on Si

C. Lange, S. Chatterjee, W.W. Rühle, Nektarios Koukourakis, Nils C. Gerhardt, Martin R. Hofmann , S. Liebich, M. Zimprich, R. Fritz, B. Kunert, K. Volz, W. Stolz - SPIE Photonics West, San Francisco, California, USA

Ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting laser devices, SPIE Photonics West

Nils C. Gerhardt, Mingyuan Li, Hendrik Jähme, Henning Höpfner, Martin R. Hofmann , T. Ackemann - San Francisco, California, USA

Novel Semiconductor Based Laser Systems and Devices

Nils C. Gerhardt, Nektarios Koukourakis, Dominic A. Funke, Mingyuan Li, Henning Höpfner, Hendrik Jähme, Tobias Schlauch, Jan C. Balzer, Claus-Stefan Friedrich, Martin R. Hofmann - GAFOE Symposium, Oak Ridge, Tennessee, USA

Ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting laser devices

Nils C. Gerhardt, Mingyuan Li, Hendrik Jähme, Henning Höpfner, Martin R. Hofmann , T. Ackemann - Proc. SPIE 7597, 75970Q

Electro-optical modulator arrays for the ultra-fast spectral tuning of external-cavity diode lasers

Hendrik Jähme, Nils C. Gerhardt, Martin R. Hofmann , Mike Bülters, Dieter Jäger - SIOE, Cardiff, UK

Experimental Evaluation of Photoacoustic Coded Excitation using Unipolar Golay Codes

Martin P. Mienkina, Claus-Stefan Friedrich, Nils C. Gerhardt, Wilko Wilkening, Martin R. Hofmann , Georg Schmitz - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol 57 (7) 2010, pp 1583-1593

Multispectral photoacoustic coded excitation imaging using unipolar orthogonal Golay codes

Martin P. Mienkina, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin F. Beckmann, Martin Schiffner, Martin R. Hofmann , Georg Schmitz - Optics Express, 2010, vol. 18, pp. 9076-9087, DOI: 10.1364/OE.18.009076

2009
THz sources and detectors based on diode lasers

Claus-Stefan Friedrich, Carsten Brenner, Stefan Hoffmann, Tobias Schlauch, Andreas Klehr, Götz Erbert, Günther Tränkle, Christian Jördens, Mohammed Salhi, Martin Koch, Martin R. Hofmann - Proc. SPIE 7197, 71970B (invited)

Compact semiconductor laser sources for photoacoustic imaging

Claus-Stefan Friedrich, Mona-Carina Wawreczko, Martin P. Mienkina, Nils C. Gerhardt, Georg Schmitz, Martin R. Hofmann - Proc. SPIE 7177, 71772H

Depth resolved holographic imaging with variable depth resolution

Nektarios Koukourakis, Michael Breede, Nils C. Gerhardt, Martin R. Hofmann , S. Köber, M. Salvador, K. Meerholz - Electronics Letters, January 2009, Volume 45, Issue 1, p. 46-48

THz sources and detectors based on diode lasers

Claus-Stefan Friedrich, Carsten Brenner, Stefan Hoffmann, Tobias Schlauch, Andreas Klehr, Götz Erbert, Günther Tränkle, Christian Jördens, Mohammed Salhi, Martin Koch, Martin R. Hofmann - SPIE Photonics West, San Jose, California, USA (invited)

Compact semiconductor laser sources for photoacoustic imaging

Claus-Stefan Friedrich, Mona-Carina Wawreczko, Martin P. Mienkina, Nils C. Gerhardt, Georg Schmitz, Martin R. Hofmann - SPIE Photonics West, San Jose, California, USA

Spin-controlled optoelectronic devices

Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A. D. Wieck, E. Schuster, H. Wende, W. Keune - phys. stat. sol C2, 436

Optical Coherence Tomography versus Micro Computer Tomography

Christoph Kasseck, Marita Kratz, Antonia Torcasio, Nils C. Gerhardt, G. Harry van Lenthe, Thilo Gambichler, Klaus Hoffmann, David B. Jones, Martin R. Hofmann - SPIE Europe, European Conference on Biomedical Optics, Munich, Germany (accepted)

New Concepts for Depth Resolved Holographic Imaging Based on Spectrally Tunable Diode Lasers

Nektarios Koukourakis, Christoph Kasseck, Nils C. Gerhardt, Martin R. Hofmann , Daniel Rytz, Sebastian Koeber, Michael Salvador, Klaus Meerholz - OSA, CLEO/IQEC, Baltimore, Maryland, USA

Semiconductor laser based THz generation and detection

Carsten Brenner, Stefan Hoffmann, Claus-Stefan Friedrich, Tobias Schlauch, A. Klehr, G. Erbert, G. Tränkle, C. Jördens, M. Salhi, M. Koch, Martin R. Hofmann - phys. stat. sol. C6, 564

New Concepts for Depth Resolved Holographic Imaging

Nektarios Koukourakis, Christoph Kasseck, Nils C. Gerhardt, Martin R. Hofmann , Daniel Rytz, Sebastian Koeber, Michael Salvador, Klaus Meerholz - OSA Spring Optics & Photonics Congress, Vancouver, BC, Canada (accepted)

Gain characteristics and lasing of Ga(NAsP) multi-quantum well structures

C. Lange, S. Chatterjee, B. Kunert, K. Volz, W. Stolz, W.W. Rühle, Nils C. Gerhardt, Martin R. Hofmann - phys. stat. sol. C6, 576

Lasing in Optically pumped Ga(NAsP)/(BGa)(AsP) Heterostructures on Silicon

C. Lange, N.S. Köster, D.J. Franzbach, S. Chatterjee, W.W. Rühle, S. Zinnkann, S. Liebich, I. Nemeth, R. Fritz, K. Volz, W. Stolz, B. Kunert, Nils C. Gerhardt, Nektarios Koukourakis, Martin R. Hofmann - OSA, CLEO/IQEC, Baltimore, Maryland, USA

Lasing of lattice-matched Ga(NAsP) quantum well heterostructures monolithically integrated on (001) Si substrate

B. Kunert, I. Németh, S. Zinnkann, G. Lukin, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Koester, D.J. Franzbach, S. Chatterjee, W. Rühle, Nils C. Gerhardt, Nektarios Koukourakis, Martin R. Hofmann - SPIE Photonics West, San Jose, California, USA

Versatile THz Homodyn System based on an amplified laser diode in an external cavity

Carsten Brenner, Martin R. Hofmann , M. K. Shakfa, M. Scheller, M. Koch, A. Klehr, G. Erbert - TeraTech, Osaka, Japan

Three-dimensional Bone Imaging: Optical Coherence Tomography versus Micro Computer Tomography

Christoph Kasseck, Marita Kratz, Antonia Torcasio, Nils C. Gerhardt, G. Harry van Lenthe, Thilo Gambichler, Klaus Hoffmann, David B. Jones, Martin R. Hofmann - SPIE Proceedings 7372-31

Laser operation of III/V compound material Ga(NAsP) grown lattice-matched on (001) Si substrate

B. Kunert, S. Liebich, S. Zinnkann, I. Németh, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Koester, D.J. Franzbach, S. Chatterjee, W. Rühle, Nils C. Gerhardt, Nektarios Koukourakis, Martin R. Hofmann - Device Research Conference, The Pennsylvania State University, University Park, USA

New Concepts for Depth Resolved Holographic Imaging Based on Spectrally Tunable Diode Lasers

Nektarios Koukourakis, Christoph Kasseck, Nils C. Gerhardt, Martin R. Hofmann , Daniel Rytz, Sebastian Koeber, Michael Salvador, Klaus Meerholz - OSA Conference paper CTuAA2

Lasing of the III/V compound semiconductor Ga(NAsP) integrated lattice-matched to Si substrate

B. Kunert, S. Liebich, M. Zimprich, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Koester, S. Chatterjee, W. Rühle, Nils C. Gerhardt, Nektarios Koukourakis, Martin R. Hofmann - 6th International Conference on Group IV Photonics (GFP), San Francisco, USA

Ultrafast Spin Dynamics in Spin-Polarized Vertical-Cavity Surface-Emitting Laser Devices

Nils C. Gerhardt, Stephan Hövel, Mingyuan Li, Hendrik Jähme, Martin R. Hofmann , T. Ackemann, A. Kroner, R. Michalzik - OSA, CLEO/IQEC, Baltimore, Maryland, USA (2009)

Spin dynamics in vertical-cavity surface-emitting lasers at room temperature

Mingyuan Li, Hendrik Jähme, Stephan Hövel, Andreas Bischoff, Nils C. Gerhardt, Martin R. Hofmann - SIOE, Cardiff, UK

New Concepts for Depth Resolved Holographic Imaging

Nektarios Koukourakis, Christoph Kasseck, Nils C. Gerhardt, Martin R. Hofmann , Daniel Rytz, Sebastian Köber, Michael Salvador, Klaus Meerholz - OSA Conference paper DMB6

Spin-relaxation measurements in VCSEL-structures at room temperature

Hendrik Jähme, Mingyuan Li, Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann - DPG Spring Meeting of the Condensed Matter Section, Dresden

Nanosecond Switching and Wavelength Tuning of External Cavity Laser Diode Using a Reflective Electro Absorption Modulator

M. Bülters, Michael Breede, Martin R. Hofmann , D. Jäger - Photonics Technology Letters

Feasibility Study of Multispectral Photoacoustic Coded Excitation using Orthogonal Unipolar Golay Codes

Martin P. Mienkina, Eder A., Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Ultrasonics Symposium (IUS), 2009 IEEE International , pp.108-111, 20-23 Sept. 2009

Multispectral Photoacoustic Coded Excitation using Orthogonal Unipolar Golay Codes

Martin P. Mienkina, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Proc IFMBE, vol 25/II, 2009, pp 217-220

Experimental evaluation of multispectral photoacoustic coded excitation using orthogonal unipolar golay codes

Martin P. Mienkina, Eder A., Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - 442. Heraeus-Seminar "Molecular Imaging", Bad Honnef, Germany

Evaluation of Ferucarbotran (Resovist ®) as a Photoacoustic Contrast Agent

Martin P. Mienkina, Claus-Stefan Friedrich, Karin Hensel, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Biomedical Engineering, vol 54, 2009, pp 83-88

Comparison of Coding Techniques for Photoacoustic Coded Excitation

Martin P. Mienkina, Eder A., Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - International Conference on Acoustics (NAG/DAGA), 2009, pp 313-316

Single-shot holography for depth resolved three dimensional imaging

Nektarios Koukourakis, Christoph Kasseck, D. Rytz, Nils C. Gerhardt, Martin R. Hofmann - Optics Express, Vol. 17 Issue 23, pp.21015-21029

Evaluation of Ferucarbotran (Resovist®) as a photoacoustic contrast agent

Martin P. Mienkina, Claus-Stefan Friedrich, Karin Hensel, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Biomedical Engineering, vol 54, 2009, pp 83-88

Feasibility study of multispectral photoacoustic coded excitation using orthogonal unipolar Golay codes

Martin P. Mienkina, Annika Eder, Georg Schmitz, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann - Proc IEEE International Ultrasonics Symposium, 2009, pp 108-111

Comparison of Coding Techniques for Photoacoustic Coded Excitation

Martin P. Mienkina, Annika Eder, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Proc International Conference on Acoustics (NAG/DAGA), 2009, pp 313-316

Multispectral Photoacoustic Coded Excitation using Orthogonal Unipolar Golay Codes

Martin P. Mienkina, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Proc IFMBE, vol 25/II, 2009, pp 217-220

2008
All-semiconductor laser driven terahertz time-domain spectrometer

C. Jördens, Tobias Schlauch, Mingyuan Li, Martin R. Hofmann , M. Bieler, M. Koch - Applied Physics B-Lasers and Optics, Vol. 93, Issue 2-3, Special Issue: Sp. Iss. SI, pp. 515-520 (Nov 2008)

New two color laser concepts for THz-generation

Claus-Stefan Friedrich, Carsten Brenner, Stefan Hoffmann, A. Schmitz, I. C. Mayorga, A. Klehr, G. Erbert, Martin R. Hofmann - IEEE J. Sel. Top. Quant. 14, 270

Room-Temperature Spin-Controlled Optoelectronic Devices

Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A. D. Wieck, E. Schuster, W. Keune - CLEO, San Jose, USA

Ferromagnet/semiconductor heterostructures and spininjection

Martin R. Hofmann , M. Oestreich - Springer Tracts in Modern Physics 227, 335 (2008) ISSN: 0081-3869

Room-Temperature Spin-Optoelectronic Devices. Spin Phenomena in Reduced Dimensions

Mingyuan Li, Hendrik Jähme, Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , A. Ludwig, D. Reuter, A.D. Wieck, F. Stromberg, H. Wende, W. Keune - Regensburg, Deutschland

Optical spin manipulation of electrically pumped vertical-cavity surface-emitting lasers

Stephan Hövel, Andreas Bischoff, Nils C. Gerhardt, Martin R. Hofmann , T. Ackemann, A. Kroner, R. Michalzik - Appl. Phys. Lett. 92, 041118

Fast control of an external-cavity laser diode using a vertical pin modulator

M. Bülters, Michael Breede, Martin R. Hofmann , D. Jäger - EOS Annual Meeting, Paris, France

Lasing of lattice-matched Ga(NAsP) quantum well heterostructures monolithically integrated on (001) Si substrate

B. Kunert, I. Németh, S. Zinnkann, G. Lukin, T.B. Adams, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Koester, D.J. Franzbach, S. Chatterjee, W. Rühle, Nils C. Gerhardt, Nektarios Koukourakis, Martin R. Hofmann - International Semiconductor Laser Conference (ISLC) San Diego, USA (2008)

Gain on Silicon: Monolithic integration of GaNAsP on Si

C. Lange, D. Franzbach, S. Chatterjee, W.W. Rühle, B. Kuhnert, I. Németh, S. Zinnkann, R. Fritz, G. Lukin, T.B. Adams, K. Volz, W. Stolz, Nils C. Gerhardt, Nektarios Koukourakis, Martin R. Hofmann - NOEKS, Klink

Semiconductor-laser based THz-generation and detection

Carsten Brenner, Stefan Hoffmann, Claus-Stefan Friedrich, Martin R. Hofmann , M. Salhi, M. Koch - NOEKS, Klink (invited)

Spin-controlled optoelectronic devices

Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A. Wieck, E. Schuster, W. Keune - NOEKS, Klink

Monolithic integration of the novel GaP-based laser material Ga(NAsP) on (001) Si substrate without any dislocation formation

B. Kunert, I. Németh, S. Zinnkann, G. Lukin, T.B. Adams, R. Fritz, K. Volz, W. Stolz, C. Lange, S. Chatterjee, W. Rühle, Nils C. Gerhardt, Nektarios Koukourakis, Martin R. Hofmann - E-MRS Spring Meeting, Strasbourg, France

Optical gain in Ga(NAsP)/(BGa)(AsP) multi-quantum-well heterostructures grown lattice-matched on (001) Silicon substrate

B. Kunert, I. Németh, S. Zinnkann, G. Lukin, T.B. Adams, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Koester, D.J. Franzbach, S. Chatterjee, W. Rühle, Nils C. Gerhardt, Nektarios Koukourakis, Martin R. Hofmann - Device Research Conference, University of California, Santa Barbara, USA

Interaction of Semiconductor Laser Dynamics with THz Radiation

Carsten Brenner, Stefan Hoffmann, Martin R. Hofmann - Adv. in Solid State Phys. 47, 179

Optical verification of gain in Ga(NAsP)/(BGa)(AsP) multi-quantum-well heterostructures monolithically grown lattice-matched on (001) silicon substrate

B. Kunert, I. Németh, S. Zinnkann, G. Lukin, T.B. Adams, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Koester, D.J. Franzbach, S. Chatterjee, W. Rühle, Nils C. Gerhardt, Nektarios Koukourakis, Martin R. Hofmann - International Symposium on Compound Semiconductors (ISCS) Europa-Park, Rust, Germany

High peak power femtosecond pulses from a mode-locked semiconductor laser in an external cavity

Tobias Schlauch, Mingyuan Li, Martin R. Hofmann , A. Klehr, G. Erbert, G. Tränkle - Electron. Lett., Vo. 44, Issue 11, pp. 678-679 (May 2008)

Electrical detection of photoinduced spins both at room temperature and in remanence

Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A.D. Wieck, E. Schuster, W. Keune, H. Wende, O. Petracic, K. Westerholt - Appl. Phys. Lett. 92, 242102

Room temperature electrical spin injection in remanence

Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , F.-Y. Lo, A. Ludwig, D. Reuter, A. D. Wieck, E. Schuster, H. Wende, W. Keune, O. Petracic, K. Westerholt - Appl. Phys. Lett. 93, 021117

Evaluation of Simplex Codes for Photoacoustic Coded Excitation

Martin P. Mienkina, Eder A., Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Proc IFMBE, vol 22, pp 444-447

Simulation Study of Photoacoustic Coded Excitation using Golay Codes

Martin P. Mienkina, Eder A., Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Proc IEEE International Ultrasonics Symposium, 1242-1245

Evaluation of Simplex Codes for Photoacoustic Coded Excitation

Martin P. Mienkina, Annika Eder, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann , Georg Schmitz - Proc. IFMBE, vol 22, 2008, pp 444-447

Simulation Study of Photoacoustic Coded Excitation using Golay Codes

Martin P. Mienkina, Annika Eder, Georg Schmitz, Claus-Stefan Friedrich, Nils C. Gerhardt, Martin R. Hofmann - Proc. IEEE International Ultrasonics Symposium, 2008, 1242-1245

2007
An optical evaluation of the phenomenon of red out in neuroendoscopic surgery: what is the physical background?

M. Scholz, Martin R. Hofmann , Michael Breede, I. Pechlivanis, M. Engelhardt, K. Schmieder, W. Konen, A. G. Harders - Child's Nervous System 23, 73

Generation and Detection of THz radiation with diode lasers

Carsten Brenner, Stefan Hoffmann, Martin R. Hofmann - SIOE, Cardiff, Wales

Spin-controlled LEDs and VCSELs

Stephan Hövel, Nils C. Gerhardt, Carsten Brenner, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A.D. Wieck, E. Schuster, W. Keune - Phys. Stat. Sol. A 204, 500

Generation of Terahertz radiation with two color semiconductor lasers

Stefan Hoffmann, Martin R. Hofmann - Laser & Photon. Rev. 1, 44 (2007) - invited

Interaction of THz radiation with semiconductor lasers

Stefan Hoffmann, Martin R. Hofmann , Carsten Brenner, M. A. Salhi, M. Koch - Photonics West SPIE, San Jose, USA (invited)

Micromirror device controlled tunable diode laser

Michael Breede, Christoph Kasseck, Carsten Brenner, Nils C. Gerhardt, Martin R. Hofmann , R. Höfling - Electron. Lett. 43, 456

Validation of optical coherence tomography in vivo using cryostat histology

T. Gambichler, G. Moussa, P. Regeniter, Christoph Kasseck, Martin R. Hofmann , F. G. Bechara, M. Sand, P. Altmeyer, K. Hoffmann - Physics in Medicine and Biology 52, N75

Diode laser based THz technology

Martin R. Hofmann - International Bunsen Discussion Meeting: Exploring THz Spectroscopy: Technology and Applications in the Field of Dynamics and Nanostructures, Bad Honnef, Germany (invited)

Detection of THz radiation with diode lasers

Carsten Brenner, Stefan Hoffmann, Martin R. Hofmann , M. Salhi, M. Koch, A. Klehr, G. Erbert, G. Tränkle - Electron. Lett. 43, 870

Interaction of semiconductor laser dynamics with THz radiation

Martin R. Hofmann - DPG, Symposium THz interactions, Regensburg, Germany (invited)

Detection of THz radiation with semiconductor diode lasers

Carsten Brenner, Stefan Hoffmann, Martin R. Hofmann , M. Salhi, M. Koch, A. Klehr, G. Erbert, G. Tränkle, J.T. Steiner, M. Kira, S.W. Koch - Appl. Phys. Lett. 91, 101107

Photoacoustic Imaging of Fibrosarcoma using RGD-Cy 3 as a Targeted Contrast Agent

Martin P. Mienkina, Claus-Stefan Friedrich, Nils C. Gerhardt, J. Waldeck, Karin Hensel, C. Bremer, Martin R. Hofmann , Georg Schmitz - Proc IEEE International Ultrasonics Symposium 0, 2409

Spectroscopic Fourier Domain Optical Coherence Tomography

Christoph Kasseck, Kirsten Lehmann, Nils C. Gerhardt, Martin R. Hofmann - SPIE Europe, European Conference on Biomedical Optics, Munich, Germany

Evaluation eines kommerziellen Ultraschallgeräts für den Einsatz im photoakustischen Reflexionsmodus

Martin P. Mienkina, Nils C. Gerhardt, J. Waldeck, Michael Breede, C. Bremer, Martin R. Hofmann , Georg Schmitz - Biomedizinische Technik 52, G2-1

Spectroscopic Fourier Domain Optical Coherence Tomography

Christoph Kasseck, Kirsten Lehmann, Nils C. Gerhardt, Martin R. Hofmann - SPIE Proceedings 6627-67

External-cavity diode laser utilizing a micromirror device for spectral tuning

Michael Breede, Christoph Kasseck, Carsten Brenner, Nils C. Gerhardt, R. Höfling, Martin R. Hofmann - SPIE Europe, Optical Metrology, Munich, Germany

Vertical pin-modulator for controlling an external-cavity diode laser

Bülters, M., Michael Breede, Martin R. Hofmann , D. Jäger - IEEE Photonics and Microsystems 2007, International Students and Young Scientists, Conference Proceedings, Dresden, Germany, pp. 11-14

External-cavitydiode laser utilizing a micromirror device for spectral tuning

Michael Breede, Christoph Kasseck, Carsten Brenner, Nils C. Gerhardt, R. Höfling, Martin R. Hofmann - Proc SPIE 6616, 66160R

THz generation with Two-color semiconductor laser

Stefan Hoffmann, Martin R. Hofmann - Laser and Photon. Rev.: Jg. 1, H. 1, S. 44-56

Evaluation eines kommerziellen Ultraschallgeräts für den Einsatz im photoakustischen Reflexionsmodus

Martin P. Mienkina, Nils C. Gerhardt, Jens Waldeck, Michael Breede, Christoph Bremer, Martin R. Hofmann , Georg Schmitz - Biomedical Engineering, Vol 52 (2007, Suppl), G2-1

Photoacoustic Imaging of Fibrosarcoma using RGD-Cy 3 as a Targeted Contrast Agent

Martin P. Mienkina, Claus-Stefan Friedrich, Jens Waldeck, Karin Hensel, Nils C. Gerhardt, C. Bremer, Martin R. Hofmann , Georg Schmitz - Proc. IEEE International Ultrasonics Symposium, 2007, pp 2409-2412

2006
Enhancement of spin information with vertical cavity surface emitting lasers

Nils C. Gerhardt, Stephan Hövel, Martin R. Hofmann , J. Yang, D. Reuter, A. Wieck - Electronics Letters 42, 88

Spin injection light-emitting diode with vertically magnetized ferromagnetic metal contacts

Nils C. Gerhardt, Stephan Hövel, Carsten Brenner, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A.D. Wieck, E. Schuster, W. Keune, S. Halm, G. Bacher, K. Westerholt - Journal of Applied Physics 99, 073907-1

Spin-controlled vertical cavity surface-emitting lasers

Stephan Hövel, Nils C. Gerhardt, Carsten Brenner, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A. D. Wieck, E. Schuster, W. Keune - Photonics Europe, Strasbourg, France (invited)

Room-temperature terahertz generation with semiconductor lasers

Carsten Brenner, Tuyen N. Le, Stefan Hoffmann, Martin R. Hofmann - Photonics Europe, Strasbourg, France

Bandwith limitations of two-colour diode lasers for direct terahertz emission

Stefan Hoffmann, Xiao Luo, Martin R. Hofmann - Electron. Lett. 42, 696

Room-temperature Terahertz detection with diode lasers

Carsten Brenner, Stefan Hoffmann, Martin R. Hofmann , M. Salhi, M. Koch - CLEO/QELS, Long Beach, USA

Vorrichtung und Verfahren zur Erzeugung von kohärenter Terahertz-Strahlung

Tränkle, G., Ebert, G., Klehr, A., Martin R. Hofmann - DE 10 2006 041 728 B4, Patenterteilung 08.04.2010

Zeitaufgelöste Holographie für biomedizinische Bildgebung

Martin Breede, Michael Breede, Martin R. Hofmann , M. Salvador, S. Köber, K. Meerholz - 107. Jahrestagung der DGaO, Weingarten

Room temperature terahertz generation with semiconductor lasers

Carsten Brenner, Tuyen N. Le, Stefan Hoffmann, Martin R. Hofmann - Proc. SPIE 6194, 61940H

Spin-controlled LEDs and VCSELs

Stephan Hövel, Nils C. Gerhardt, Carsten Brenner, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A. Wieck, E. Schuster, W. Keune - ICSNN, Istanbul, Turkey (invited)

Zeitaufgelöste Holographie für biomedizinische Bildgebung

Michael Breede, Martin Breede, Martin R. Hofmann , M.Salvador, S.Köber, K.Meerholz - DGaO-Proceedings 107

Fourier transform external cavity lasers

Michael Breede, Stefan Hoffmann, Martin R. Hofmann - Symposium on Opto- and Microelectronic Devices and Circuits, Duisburg, Germany

Spin-controlled vertical cavity surface-emitting lasers

Stephan Hövel, Nils C. Gerhardt, Carsten Brenner, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A. D. Wieck, E. Schuster, W. Keune - Proc. SPIE 6184, 61840Y

Lasing in optically pumped Ga(NAsP)/GaP heterostructures

S. Borck, S. Chatterjee, B. Kunert, K. Volz, W. Stolz, J. Heber, W. W. Rühle, Nils C. Gerhardt, Martin R. Hofmann - Appl. Phys. Lett. 89, 031102

External cavity hybrid-mode-locked semiconductor laser with intracavity spatial light modulator for pulse compression

Tuyen N. Le, Michael Breede, Martin R. Hofmann , A. Klehr, G. Ebert - Semiconductor and integrated optoelectronics SIOE06, Cardiff, Wales

Experimental Characterization of Ferucarbotran as a Photoacoustic Contrast Agent

Martin P. Mienkina, Karin Hensel, Tuyen N. Le, Nils C. Gerhardt, Ch. Hansen, Martin R. Hofmann , Georg Schmitz - Proc IEEE International Ultrasonics Symposium 0, 393

Diode laser based THz radiation sources

Martin R. Hofmann , Carsten Brenner, Stefan Hoffmann, Tuyen N. Le - European Conference on nondestructive testing, ECNDT 2006, Berlin, Germany

Experimentelle Charakterisierung von Ferucarbotran als photoakustisches Kontrastmittel

Martin P. Mienkina, Karin Hensel, Tuyen N. Le, Nils C. Gerhardt, E. Bründermann, M. Havenith, Martin R. Hofmann , Georg Schmitz - Proc Gemeinsame Jahrestagung der Deutschen, Österreichischen und Schweizerischen Gesellschaften für Biomedizinische Technik 51, V180

Hybrid and passive mode-locking of a two-section laser diode in a Fourier transform external cavity

Tuyen N. Le, Martin R. Hofmann , A. Klehr, G.Erbert - IEE Proceedings Optoelectronics 153, 312

Experimental Characterization of Ferucarbotran (Resovist ®) as a Photoacoustic Nanoparticle Contrast Agent

Martin P. Mienkina, Karin Hensel, L. N. Tuyen, Nils C. Gerhardt, Christian Hansen, Martin R. Hofmann , Georg Schmitz - Proc IEEE International Ultrasonics Symposium, 2006, pp 393-396

Experimentelle Charakterisierung von Ferucarbotran als photoakustisches Kontrastmittel

Martin P. Mienkina, Karin Hensel, Tuyen N. Le, Nils C. Gerhardt, Ilona Kopf, Erik Bründermann, Martina Havenith, Martin R. Hofmann , Georg Schmitz - Biomedical Engineering, Vol 51 (2006 Suppl), V180

2005
Two-color diode lasers for generation of THz radiation

Stefan Hoffmann, Martin R. Hofmann , M. Kira, S.W. Koch - Semiconductor Science and Technology 20, 205 (2005) - invited

Terahertz Generation with Two Color Diode Lasers

Stefan Hoffmann, Martin R. Hofmann - LEOS Annual Meeting, Sydney, Australia (invited)

Spin controlled optically pumped vertical cavity surface emitting laser

Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , J. Yang, D. Reuter, A. Wieck - Electronics Letters 41, 251

Spin-controlled LEDs and VCSELs

Nils C. Gerhardt, Stephan Hövel, Carsten Brenner, Martin R. Hofmann , J. Yang, D. Reuter, A. D. Wieck - Proc. SPIE 5722, 221

Spin-controlled LEDs and VCSELs

Nils C. Gerhardt, Stephan Hövel, Carsten Brenner, Martin R. Hofmann , J. Yang, D. Reuter, A. D. Wieck - SPIE Photonics West, San Jose, California, USA

Electron spin injection into GaAs from ferromagnetic contacts in remanence

Nils C. Gerhardt, Stephan Hövel, Carsten Brenner, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A. D. Wieck, E. Schuster, W. Keune, K. Westerholt - Appl. Phys. Lett. 87, 032502

Elektrische Spininjektion über ferromagnetische Kontakte in LEDs im remanenten Zustand

Nils C. Gerhardt, Stephan Hövel, Martin R. Hofmann , F.-Y. Lo, D. Reuter, A.D. Wieck, E. Schuster, W. Keune - DPG Frühjahrstagung, Berlin, Germany (2005)

Spinabhängige Polarisation eines optisch gepumpten VCSELs

Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , J. Yang, D. Reuter, A.D. Wieck - DPG Frühjahrstagung, Berlin, Germany (2005)

Spin dependent polarisation of optically pumped VCSELs

Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , J. Yang, D. Reuter, A. D. Wieck - SIOE, Cardiff, Wales

Terahertz-Strahlung entgeht nichts

Stefan Hoffmann, Martin R. Hofmann - Rubin, Jg. 1/05, S. 42-48

2004
Two-color semiconductor lasers

Stefan Hoffmann, Martin Breede, Martin R. Hofmann - SPIE Photonics West, San Jose, California, USA (invited)

Linewidth enhancement factor and optical gain in (GaIn)(NAs)/GaAs lasers

Nils C. Gerhardt, Martin R. Hofmann , J. Hader, J.V. Moloney, S.W. Koch, H. Riechert - Appl. Phys. Lett. 84, 1

Two-color semiconductor lasers

Stefan Hoffmann, Martin Breede, Martin R. Hofmann - Proc. SPIE 5349, 218 (2004) Physics and Simulation of Optoelectronic Devices XII

Four-wave mixing and direct terahertz emission with two-color semiconductor lasers

Stefan Hoffmann, Martin R. Hofmann , E. Bründermann, M. Havenith, M. Matus, J.V. Moloney, A.S. Moskalenko, M. Kira, S.W. Koch, S. Saito, K. Sakai - Appl. Phys. Lett. 84, 3585

THz Generation with Two-Color Semiconductor Laser

Stefan Hoffmann, Martin R. Hofmann - IRMMW, Karlsruhe

Gain and emission dynamics of (GaIn)(NAs) lasers

Martin R. Hofmann , Nils C. Gerhardt - 2nd International Workshop on Metastable Compound Semiconductors and Heterostructures, Marburg, Germany

Herstellung und Charakterisierung optisch gepumpter, oberflächenemittierender Halbleiterlaser

Stephan Hövel, Nils C. Gerhardt, Martin R. Hofmann , J. Yang, D. Reuter, A.D. Wieck - DPG Frühjahrstagung, Regensburg, Germany (2004)

Dynamics of two-color laser systems with spectrally filtered feedback

M. Matus, M. Kolesik, J.V. Moloney, Martin R. Hofmann , S.W. Koch - J. Opt. Soc. Am. B 21, 1758

Two-color semiconductor lasers for generation of THz radiation

Stefan Hoffmann, Martin R. Hofmann - European Semiconductor Laser Workshop, Särö, Sweden

Experimental analysis of the optical gain and linewidth enhancement factor of GaInNAs/GaAs lasers

Nils C. Gerhardt, Martin R. Hofmann - J. Phys.: Condens. Matter 16, S3095 (2004) - invited

Physics of semiconductor lasers

S.W. Koch, Martin R. Hofmann - Encyclopedia of Modern Optics, Academic Press, Lon 2, 502 (2004) eds. R.D. Guenther et al., Elsevier, Oxford

2003
Optical spectroscopy of 1.3 µm (GaIn)(NAs)/GaAs lasers

Nils C. Gerhardt, Martin R. Hofmann , W.W. Rühle - IEEE Proceedings Optoelectronics 150, 45

Postgrowth nondestructive characterization of dilute-Nitride VCSELs using electroreflectance spectroscopy

S.A. Choulis, T.J.C. Hosea, S. Ghosh, P.J. Klar, Martin R. Hofmann - IEEE Photonics Technology Lett. 15, 1026

Gain and emission dynamics of dilute nitride quantum well lasers

Martin R. Hofmann , Nils C. Gerhardt - Annual Meeting Optical Society of America, Tucson, Arizona, USA (invited)

Experimentelle Methoden zur Bestimmung der optischen Verstärkung von 1.3µm (GaIn)(NAs)/GaAs Halbleiterlasern

Nils C. Gerhardt, Martin R. Hofmann - DPG Frühjahrstagung, Dresden, Germany (2003)

Gain and emission dynamics of dilute nitride Gain quantum well lasers

Martin R. Hofmann , Nils C. Gerhardt - IEEE JOURNAL OF QUANTUM ELECTRONICS, Volume: 38 Issue: 2 Pages: 213-221 Published: FEB 2002

2002
Tunable blue laser based on intracavity frequency doubling with a fan-structured periodically poled LiTaO3 crystal

J. Zimmermann, J. Struckmeier, Martin R. Hofmann , J.-P. Meyn - Opt. Lett. 27, 604

Dual-wavelength external-cavity fiber-laser

T. Kleine-Ostmann, P. Knobloch, R. Caspary, U. Unrau, Martin R. Hofmann , M. Koch - Electronics Letters 38, 309

Quantitative prediction of semiconductor laser characteristics based on low intensity photo luminescence measurtements

J. Hader, A.R. Zakharian, J.V. Moloney, T.R. Nelson, J.E. Ehret, K. Hantke, Martin R. Hofmann , S.W. Koch - IEEE Photon. Technol. 14, 762

Physics of semiconductor lasers

S.W. Koch, Martin R. Hofmann - Encyclopedia of Modern Optics, Academic Press, London 0

Semiconductor laser with simultaneous tunable dual wavelength emission

Martin Breede, T. Höner zu Siederdissen, Martin R. Hofmann , Stefan Hoffmann, J. Kovacs, J. Struckmeier, J. Zimmermann, T. Kleine-Ostmann, P. Knobloch, M. Koch - SPIE Photonics West, San Jose, USA

Semiconductor laser with simultaneous tunable dual wavelength emission

Martin Breede, T. Höner zu Siederdissen, Martin R. Hofmann , Stefan Hoffmann, J. Kovacs, J. Struckmeier, J. Zimmermann, T. Kleine-Ostmann, P. Knobloch, M. Koch - Proc. SPIE 4646, 439

Laserdioden-basierendes Terahertz-Imaging-System

Martin R. Hofmann , Stefan Hoffmann, T. Kleine-Ostmann, P. Knobloch, M. Koch - Photonik 34, 88

Fourier-Transform External Cavity lasers

Martin Breede, Stefan Hoffmann, J. Zimmermann, J. Struckmeier, Martin R. Hofmann , T. Kleine-Ostmann, P. Knobloch, M. Koch, J.P. Meyn, M. Matus, S.W. Koch, J.V. Moloney - Opt. Commun. 207, 261

Optical gain of 1.3 µm (GaIn)(NAs)/GaAs lasers: a comparison between theory and experiment

Nils C. Gerhardt, Martin R. Hofmann , W. Stolz, S.W. Koch, J. Hader, J.V. Moloney, A. Yu. Egorov, H. Riechert - SIOE, Cardiff, Wales

Interband transitions of quantum wells and device structures containing Ga(N,As) and (Ga,In)(N,As)

P.J. Klar, H. Grüning, W. Heimbrodt, G. Weiser, J. Koch, K. Volz, W. Stolz, S.W. Koch, S. Tomic, S.A. Choulis, T.J.C. Hosea, E.P. O'Reilly, Martin R. Hofmann , J. Hader, J.V. Moloney - Sem. Science and Technol. 17, 830

Semiconductor quantum-well designer active materials

J. Hader, A.R. Zakharian, J.V. Moloney, T.R. Nelson, W.J. Siskanietz, J.E. Ehret, K. Hantke, S.W. Koch, Martin R. Hofmann - Optics & Photonics News 13

Coulomb correlations and biexciton structures in coherent excitation spectroscopy on semiconductor quantum wells

E. Finger, S. Kraft, Martin R. Hofmann , T. Meier, S.W. Koch, W. Stolz, W.W. Rhle, A. Wieck - phys. stat. sol. (b) 234, 414

Compact and cost-effective continuous wave THz imaging system

T. Kleine-Ostmann, P. Knobloch, M. Koch, Stefan Hoffmann, Martin R. Hofmann , G. Hein, K. Pierz - CLEO/QELS, Long Beach, USA

Optical gain of 1.3 µm (GaIn)(NAs)/GaAs lasers

Nils C. Gerhardt, Martin R. Hofmann - International Research Workshop on The Physics and Technology of Dilute Nitrides for Optical Communications, Istanbul, Türkei (invited)

Medical THz imaging: an investigation of histo-pathological samples

P. Knobloch, C. Schildknecht, T. Kleine-Ostmann, M. Koch, Stefan Hoffmann, Martin R. Hofmann , E. Rehberg, M. Sperling, K. Donhuijsen, G. Hein, K. Pierz - Phys. Med. Biol. 47, 3875

Dual-wavelength external-cavity diode laser for CW-THz generation

Martin Breede, Stefan Hoffmann, Martin R. Hofmann , T. Kleine-Ostmann, P. Knobloch, M. Koch - Nefertiti international workshop, Duisburg

Emission dynamics and optical gain of 1.3 µm (GaIn)(NAs)/GaAs lasers

Martin R. Hofmann , Nils C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, W. Stolz, S.W. Koch, W.W. Rühle, J. Hader, J. V. Moloney, E.P. O'Reilly, B. Borchert, A. Yu. Egorov, H. Riechert, H.C. Schneider, W.W. Chow - IEEE J. Quantum Electron. 38, 213

Influence of growth conditions on the optical gain of 1.3 µm (GaIn)(NAs)/GaAs lasers

Nils C. Gerhardt, Martin R. Hofmann , K. Handtke, W. Stolz, S.W. Koch, J. Hader, J.V. Moloney, A. Yu. Egorov, H. Riechert - International Semiconductor Laser Conference, Garmisch-Partenkichen, Germany

The Osteoblast Mechanoreceptor, Microgravity Perception and Thermodynamics

Erk Mennenga-Klopp , D. Graff, J. Struckmeier, M. Born, S. Curtze, Martin R. Hofmann , D.B. Jones - Journal of Gravitational Physiology 9, 269

Physics of 1.3 µm (GaIn)(NAs)/GaAs semiconductor lasers

Martin R. Hofmann , Nils C. Gerhardt, Wagner, A., Stolz, W., Koch, S. W., Rühle, W. W., Hader, J. - 14th Annual Meeting of the IEEE, LEOS 2001, Lasers and Electro-Optics Society, Jahr 2002, H 1, S. 326-327

2001
Dynamic studies on living cells with an atomic force fluorescence-microscope

J. Struckmeier, Erk Mennenga-Klopp , M. Born, Martin R. Hofmann , J. Tenbosch, D. Rink, D. W. Jones, S. Ecke, H. Butt - Biomedical optics, München

Microgravity sensing, mechano-sensing and osteoblasts

D. Jones, S. Curze, T.Rieger, M. Kratz, J. Struckmeier, E. Klopp, Martin R. Hofmann , T. van Cleynerbreugel, J. van der Sloten - Proceedings of the 15th ESA-SP 471, 395

Spintronic: Spin electronics and optoelectronics in semiconductors

M. Oestreich, J. Hübner, D. Hägele, M. Bender, Nils C. Gerhardt, Martin R. Hofmann , W.W. Rühle, H. Kalt, T. Hartmann, P. Klar, W. Heimbrodt, W. Stolz - Festkörperprobleme 41, 173-186

Microgravity sensing, mechano-sensing and osteoblasts

D. Jones, S. Curze, T. Rieger, M. Kratz, J. Struckmeier, Erk Mennenga-Klopp , Martin R. Hofmann , T. van Cleynerbreugel, J. van der Sloten - 15th ESA symposium on European Rocket and Balloon Programmes and Related Research, Biarritz, France

Dynamic studies on living cells with an atomic force fluorescence-microscope

J. Struckmeier, Erk Mennenga-Klopp , M. Born, J. Tenbosch, D. Rink, S. Ecke, H. Butt, Martin R. Hofmann , D. B. Jones - Proc. SPIE 4260, 7

Real-time atomic force fluorescence microscopy on living cells

J. Struckmeier, Erk Mennenga-Klopp , M. Born, J. Tenbosch, D. Rink, S. Ecke, H. Butt, Martin R. Hofmann , D. B. Jones - Proc. SPIE 4434, 142

Excitons and biexcitons as mesoscopic probes of disorder in semiconductor heterostructures

E. Finger, S. Kraft, Martin R. Hofmann , S. Nau, G. Bernatz, W. Stolz, T. Meier, P. Thomas, S.W. Koch, W.W. Rühle - CLEO/QUELS, Baltimore, USA

Emission dynamics of (GaIn)(NAs)/GaAs lasers emitting at 1.3 µm

Martin R. Hofmann , A. Wagner, Nils C. Gerhardt, C. Ellmers, F. Höhnsdorf, J. Koch, S. Leu, W. Stolz, W. W. Rühle - Proc. SPIE 4283, 256 (2001) - invited

Physics of 1.3 µm (GaIn)(NAs)/GaAs lasers

Martin R. Hofmann , Nils C. Gerhardt, A. Wagner, W. Stolz, S.W. Koch, W.W. Rhle, J. Hader, J. V. Moloney - LEOS, San Diego, USA (invited)

Continuous Wave THz-imaging

T. Kleine-Ostmann, P. Knobloch, M. Koch, Stefan Hoffmann, Martin Breede, Martin R. Hofmann , G. Hein, K. Pierz, M. Sperling, K. Donhuijsen - Electronics Letters 37, 1461

Influence of varying N-environments on the properties of (Ga,In)(N,As) vertical-cavity surface emitting lasers

S.A. Choulis, T.J.C. Hosea, P.J. Klar, Martin R. Hofmann , W. Stolz - Appl. Phys. Lett. 79, 4277

Gain spectra of (GaIn)(NAs)/GaAs laser diodes for the 1.3 µm wavelength range

Martin R. Hofmann , A. Wagner, C. Ellmers, C. Schlichenmeier, S. Schäfer, F. Höhnsdorf, J. Koch, S. Leu, W. Stolz, S.W. Koch, W.W. Rühle, J. Hader, J. V. Moloney, E.P. O'Reilly, B. Borchert, A. Yu. Egorov, H. Riechert - Appl. Phys. Lett. 78, 3009

Optische Verstärkung von (GaIn)(NAs)/GaAs Halbleiterlasern

Nils C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, W. Stolz, Martin R. Hofmann , S.W. Koch, W.W. Rühle, J. Hader , J.V. Moloney - DPG Frühjahrstagung, Hamburg, Germany (2001)

Gain of 1.3 µm (GaIn)(NAs)/GaAs lasers, Workshop on novel gain materials

Martin R. Hofmann , Nils C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, S. Leu, W. Stolz, S.W. Koch, W.W. Rühle, B. Borchert, A. Yu. Egorov, H. Riechert - Würzburg, Germany

Physics of (GaIn)(NAs) lasers

Martin R. Hofmann - Ultrafast nonlinear optics and semiconductor lasers - workshop

2000
Analysis of disorder-induced dephasing

S. Weiser, T. Meier, J. Möbius, A. Euteneuer, E. Mayer, W. Stolz, Martin R. Hofmann , W. Rühle, P. Thomas, S.W. Koch - CLEO/IQEC Europe, Nice, France

Strahlungsmeßvorrichtung (Femtosekunden - Autokorrelator)

Euteneuer A., Gießen H., Martin R. Hofmann - DE 199 26 812.6, PCT/EP00/05177, US 10/009,589, Patent erteilt am 14.12.2000

Emission dynamics and gain of (GaIn)(NAs)/GaAs lasers

Nils C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, W. Stolz, Martin R. Hofmann , S.W. Koch, W.W. Rühle, J. Hader , J.V. Moloney - Microcavity and Photonics Workshop, Ascona, Schweiz

Portable fluorescence photometer for monitoring free calcium

J. Struckmeier, Erk Mennenga-Klopp , M. Born, Martin R. Hofmann , J. Tenbosch, D.B. Jones - Rev. Sci. Inst 71, 4531

Coherent coupling in inhomogeneously broadened exciton ensembles

E. Finger, A. Euteneuer, Martin R. Hofmann , W. Stolz, W.W. Rühle - CLEO/IQEC Europe, Nice, France

Gain and emission dynamics of (GaIn)(NAs)/GaAs lasers

A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, S. Leu, W. Stolz, Martin R. Hofmann , W.W. Rühle - phys. stat. sol. 221, 567

Coherent coupling of excitons in disordered quantum-well structures

E. Finger, S. Kraft, A. Euteneuer, Martin R. Hofmann , W. Stolz, W.W. Rühle - phys. stat. sol. 221, 373

Emission dynamics of (GaIn)(NAs)/GaAs VCSELs

A. Wagner, C. Ellmers, J. Koch, F. Höhnsdorf, S. Leu, W. Stolz, Martin R. Hofmann , W.W. Rühle - European VCSEL-workshop, Brussels

Disorder induced dephasing in semiconductors

S. Weiser, T. Meier, J. Möbius, A. Euteneuer, E.J. Mayer, W. Stolz, Martin R. Hofmann , W.W. Rühle, P. Thomas, S.W. Koch - Phys. Rev. B 61, 13088

Emission dynamics of (GaIn)(NAs) vertical-cavity surface-emitting lasers

A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, C. Agert, Martin R. Hofmann , W.W. Rühle, W. Stolz - CLEO/IQEQ, San Francisco, USA

Investigation of disordered semiconductor quantum-wells by coherent excitation spectroscopy

A. Euteneuer, E. Finger, W. Stolz, T. Meier, P. Thomas, S.W. Koch, Martin R. Hofmann , W.W. Rühle - phys. stat. sol. (a) 178, 183

Normal-mode linewidths in a semiconductor microcavity with various cavity qualities

Martin R. Hofmann , D. Karaiskaj, C. Ellmers, T. Maxisch, F. Jahnke, H.-J. Kolbe, G. Weiser, R. Rettig, S. Leu, W. Stolz, S.W. Koch, W.W. Rühle - phys. stat. sol.(a) 178, 179

Coherent coupling of excitons in disordered quantum-well structures

E. Finger, A. Euteneuer, Martin R. Hofmann , W. Stolz, W.W. Rühle - Nonlinear optics and excitation kinetics in semiconductors, Marburg

Gain and emission dynamics of (GaIn)(NAs)/GaAs lasers

A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, S. Leu, W. Stolz, Martin R. Hofmann , W.W. Rühle - Nonlinear optics and excitation kinetics in semiconductors, Marburg

Gain and emission dynamics of (GaIn)(NAs)/GaAs semiconductor lasers

A. Wagner, C. Ellmers, J. Koch, F. Höhnsdorf, S. Leu, W. Stolz, Martin R. Hofmann , W.W. Rühle - International COST 267 workshop, Berlin (invited)

New portable time-resolved photometer for monitoring the calcium dynamics of osteoblasts under mechanical and zero-gravity stimulation

J. Struckmeier, J. Tenbosch, Erk Mennenga-Klopp , M. Born, Martin R. Hofmann , D.W. Jones - Proc. SPIE 3921, 114

Oberflächenemittierende (GaIn)(NAs)/GaAs Halbleiterlaser mit optimierter Dynamik

Martin R. Hofmann , A. Wagner, C. Ellmers, J. Koch, F. Höhnsdorf, S. Leu, W. Stolz, W.W. Rühle - Symposium "Infrarote oberflächenemittierende Halbleiterlaser", DPG-Frühjahrstagung, Regensburg

(GaIn)(NAs)/GaAs vertical-cavity surface-emitting laser with ultrabroad temperature operation range

A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, C. Agert, S. Leu, Martin R. Hofmann , W. Stolz, W.W. Rühle - Appl. Phys. Lett. 76, 271

Spectral filtering of femtosecond laser pulses by interference filters

R. Szipöcs, A. Köházi-Kis, P. Apai, E. Finger, A. Euteneuer, Martin R. Hofmann - Appl. Phys. B 70, 63

New portable time-resolved photometer for monitoring the calcium dynamics of osteoblasts under mechanical and zero-gravity stimulation

J. Struckmeier, J. Tenbosch, Erk Mennenga-Klopp , M. Born, Martin R. Hofmann , D.W. Jones - SPIE Photonics West, San Jose, USA (invited)

Multi-color, mode-locked Ti:sapphire laser with zero pulse jitter

R. Szipöcs, A. Euteneuer, E. Finger, Martin R. Hofmann - J. of Laser Physics 10, 1 (2000)

1999
ETECAL - Eine neue Generation durchstimmbarer Diodenlaser

Martin R. Hofmann , J. Struckmeier, Martin Breede, B. Smarsly, A. Euteneuer - LaserOpto 31, 42

High-precision gain measurements on quantum-well laser diodes

Martin R. Hofmann - Gain and recombination in semiconductors, Grasmere, Großbritannien

Elektronisch abstimmbarer Diodenlaser

Martin R. Hofmann - Sensor report 14, 31

Energy loss rate of excitons in GaN

D. Hägele, R. Zimmermann, M. Oestreich, Martin R. Hofmann , W.W. Rühle, B.K. Meyer, H. Amano, I. Akasaki - Physica B 272, 409

Normal-mode linewidths in a semiconductor microcavity with various cavity qualities

Martin R. Hofmann , D. Karaiskaj, C. Ellmers, T. Maxisch, F. Jahnke, H.-J. Kolbe, G. Weiser, R. Rettig, S. Leu, W. Stolz, S.W. Koch, W.W. Rühle - OECS-6, Ascona, Schweiz (invited)

Distribution of exciton binding-energies in disordered semiconductor quantum-wells

A. Euteneuer, E. Finger, Martin R. Hofmann , W. Stolz, T. Meier, P. Thomas, S.W. Koch, W.W. Rühle - OECS-6, Ascona, Schweiz

Electronically tunable external cavity laser diode

J. Struckmeier, A. Euteneuer, B. Smarsly, Martin Breede, M. Born, Martin R. Hofmann , L. Hildebrand, J. Sacher - Opt. Lett. 24, 1573

Energy loss rate of excitons in GaN

D. Hägele, R. Zimmermann, Martin R. Hofmann , W.W. Rühle, M. Oestreich, B.K. Meyer, H. Amano, I. Akasaki - HCIS-11, Kyoto, Japan

Coherent excitation spectroscopy on inhomogeneous exciton ensembles

A. Euteneuer, E. Finger, Martin R. Hofmann , W. Stolz, T. Meier, P. Thomas, S.W. Koch, W.W. Rühle, R. Hey, K. Ploog - Phys. Rev. Lett. 83, 2073

Ultrafast (GaIn)(NAs)/GaAs vertical-cavity surface-emitting laser for the 1.3 µm wavelength regime

C. Ellmers, F. Höhnsdorf, J. Koch, C. Agert, S. Leu, D. Karaiskaj, Martin R. Hofmann , W. Stolz, W.W. Rühle - Appl. Phys. Lett. 74, 2271

Linewidths in a semiconductor microcavity with variable strength of normal-mode coupling

D. Karaiskaj, T. Maxisch, C. Ellmers, H.-J. Kolbe, G. Weiser, R. Rettig, S. Leu, W. Stolz, Martin R. Hofmann , F. Jahnke, S.W. Koch, W. Rühle - Phys. Rev. B 59, 13525

Spectral filtering of femtosecond laser pulses by interference filters

R. Szipöcs, A. Köházi-Kis, P. Apai, E. Finger, A. Euteneuer, Martin R. Hofmann - Ultrafast Optics, Ascona, Schweiz

Multi-color, mode-locked Ti:sapphire laser with zero pulse jitte

R. Szipöcs, A. Euteneuer, E. Finger, Martin R. Hofmann - 8th International Laser Physics Workshop, Budapest, Ungarn

Electronically tunable external cavity laserdiode

J. Struckmeier, B. Smarsly, A. Euteneuer, Martin R. Hofmann - Laser 99, München

Miniature autocorrelator

A. Euteneuer, H. Gießen, Martin R. Hofmann - Laser 99, München

Cooling dynamics of excitons in GaN

D. Hägele, R. Zimmermann, M. Oestreich, Martin R. Hofmann , W.W. Rühle, B.K. Meyer, H. Amano, I. Akasaki - Phys. Rev. B 59, R7797

Optically pumped (GaIn)As/Ga(PAs) vertical-cavity surface-emitting lasers with optimized dynamics

C. Ellmers, Martin R. Hofmann , D. Karaiskaj, S. Leu, W. Stolz, W.W. Rühle, M. Hilpert - Appl. Phys. Lett. 74, 1367

Ultrafast dynamical response of strain-compensated (GaIn)As/Ga(PAs) microcavity lasers

C. Ellmers, S. Leu, Martin R. Hofmann , D. Karaiskaj, W.W. Rühle, W. Stolz - Proc. SPIE 3627, 70

Distribution of exciton binding-energies in disordered semiconductor quantum-wells

A. Euteneuer, E. Finger, Martin R. Hofmann , W. Stolz, T. Meier, P. Thomas, S.W. Koch, W.W. Rühle - CLEO/QELS, Baltimore, USA

Diodenlaser für medizinische Forschung und Meßtechnik

Martin R. Hofmann , J. Struckmeier, D. Jones, T. Pohl - Hannovermesse Industrie, Hannover

Gain and emission dynamics of semiconductor lasers

Martin R. Hofmann - Recent Res. Devel. Applied Phys. 2, 269

Elektrooptisch gesteuerter Laserresonator ohne mechanischbewegliche Teile, insbesondere für spektral abstimmbare Laser und für räumlich steuerbaren Ausgangsstrahl

Martin R. Hofmann , Struckmeier, J., Euteneuer, A., Smarsly, B. - DE 199 09 497 C1, Patent erteilt am 05.07.2000

Ultrafast dynamical response of strain-compensated (GaIn)As/Ga(PAs) microcavity lasers

C. Ellmers, S. Leu, Martin R. Hofmann , D. Karaiskaj, W.W. Rühle, W. Stolz - SPIE Photonics West, OE/LASE San Jose, USA

Ultrafast physics in Nitrides

Martin R. Hofmann , R. Zimmermann, M. Oestreich, W.W. Rühle - Materials Science & Engineering B 59, 141

1998
Emission dynamics of a (GaIn)(NAs) vertical-cavity surface-emitting laser

C. Ellmers, F. Höhnsdorf, J. Koch, C. Agert, Martin R. Hofmann , W.W. Rühle, W. Stolz - post-deadline paper CLEO/EQEC, Glasgow, U.K.

GaAs-based VCSEL-structures with strain-compensated (GaIn)As/Ga(PAs)-MQWH active regions grown by using TBAs and TBP

C. Ellmers, S. Leu, R. Rettig, Martin R. Hofmann , W.W. Rühle, W. Stolz - J. Crystal Growth 195, 630

GaAs-based VCSEL-structures with strain-compensated (GaIn)As/Ga(PAs)- MQWH active regions grown by using TBAs and TBP

C. Ellmers, S. Leu, R. Rettig, Martin R. Hofmann , W.W. Rühle, W. Stolz - ICMOVPE IX, La Jolla, California, USA

Pump geometry for resonant and quasi- resonant optical excitation of microcavity lasers

Martin R. Hofmann , F. Jahnke, C. Ellmers, M. Oestreich, H.C. Schneider, F. Jahnke, S.W. Koch, W.W. Rühle, M. Hilpert, H. Klann, H.D. Wolf, D. Bernklau, H. Riechert - Opt. Lett. 23, 849

Gain dynamics of semiconductor lasers

Martin R. Hofmann - Proc. SPIE 3283, 109 (1998) Physics and Simulation of Optoelectronic Devices VI

Measurement and calculation of gain spectra for (GaIn)As/(AlGaAs) single quantum well lasers

C. Ellmers, Martin R. Hofmann , W.W. Rühle, A. Girndt, F. Jahnke, A. Knorr, S.W. Koch, C. Hanke, L. Korte, C. Hoyler - Appl. Phys. Lett. 72, 1647

Ultrafast physics in Nitrides

Martin R. Hofmann , R. Zimmermann, M. Oestreich, W.W. Rühle - E-MRS/ICAM Meeting, Strasbourg, France (invited)

MOVPE Growth of Strain-compensated GaAs-based VCSEL-Structures

S. Leu, R. Rettig, C. Ellmers, Martin R. Hofmann , W.W. Rühle, W. Stolz - 193rd WE-Heraeus Symposium, Loveno di Menaggio, Italien (invited)

Picosecond pulse emission of optically pumped vertical cavity surface emitting lasers: Influence of carrier relaxation

C. Ellmers, Martin R. Hofmann , M. Oestreich, H.C. Schneider, F. Jahnke, S.W. Koch, W. W. Rühle, M. Hilpert, H. Klann, H.D. Wolf, D. Bernklau, H. Riechert - 193rd WE-Heraeus Symposium, Loveno di Menaggio, Italien (invited)

Gain spectra of an (InGa)As single quantum well laser diode

C. Ellmers, Martin R. Hofmann , W.W. Rühle, A. Girndt, F. Jahnke, W.W. Chow, A. Knorr, S.W. Koch, C. Hanke, L. Korte, C. Hoyler - phys. stat. sol. (b) 206, 407

Gain dynamics of semiconductor lasers

Martin R. Hofmann - SPIE Photonics West, OE/LASE San Jose, USA (invited)

1997
Transient four-wave-mixing spectroscopy on Gallium Nitride: Energy splittings of intrinsic excitonic resonances

R. Zimmermann, A. Euteneuer, J. Möbius, D. Weber, Martin R. Hofmann , W.W. Rühle, E.O. Göbel, B.K. Meyer, H. Amano, I. Akasaki - Phys. Rev. B 56, R12722

Biexcitonic binding energies in the transition from three- to two-dimensional semiconductors

A. Euteneuer, J. Möbius, R. Rettig, Martin R. Hofmann , E. Mayer, W. Stolz, E.O. Göbel, W.W. Rühle - Phys. Rev. B 56, R10028

Confinement dependence of biexcitonic binding energies in semiconductor quantum wells

A. Euteneuer, J. Möbius, R. Rettig, Martin R. Hofmann , E. Mayer, W. Stolz, E.O. Göbel, W.W. Rühle - phys. stat. sol. (a) 164, 253

Confinement dependence of biexcitonic binding energies in semiconductor quantum wells

A. Euteneuer, J. Möbius, R. Rettig, Martin R. Hofmann , E. Mayer, W. Stolz, E.O. Göbel, W.W. Rühle - OECS-5, Göttingen, Germany

Gain spectra of an (InGa)As single quantum well laser diode

C. Ellmers, Martin R. Hofmann , W.W. Rühle, A. Girndt, F. Jahnke, W.W. Chow, A. Knorr, S.W. Koch, C. Hanke, L. Korte, C. Hoyler - NOEKS, Gral Müritz, Germany (invited)

Transient four wave mixing experiments on GaN

R. Zimmermann, A. Euteneuer, J. Möbius, D. Weber, Martin R. Hofmann , W.W. Rühle, E.O. Göbel, B.K. Meyer, H. Amano, I. Akasaki - MRS Internet Journal of Nitride Research 2, 24

Quantum beat spectroscopy on excitons in GaN

R. Zimmermann, A. Euteneuer, J. Möbius, D. Weber, Martin R. Hofmann , W.W. Rühle, E.O. Göbel, B.K. Meyer, H. Amano, I. Akasaki - Materials Science; Engineering B. 50, 205

Quantum beat spectroscopy on excitons in GaN

R. Zimmermann, A. Euteneuer, J. Möbius, D. Weber, Martin R. Hofmann , W.W. Rühle, E.O. Göbel, B.K. Meyer, H. Amano, I. Akasaki - E-MRS/ICAM, Strasbourg, France

Influence of carrier relaxation on the dynamics of stimulated emission in microcavity lasers

M. Hilpert, Martin R. Hofmann , C. Ellmers, M. Oestreich, H.C. Schneider, F. Jahnke, S.W. Koch, W.W. Rühle, H.D. Wolf, D. Bernklau, H. Riechert - Appl. Phys. Lett. 71, 3761

Influence of carrier cooling on the emission dynamics of semiconductor microcavity lasers

M. Hilpert, Martin R. Hofmann , C. Ellmers, M. Oestreich, H.C. Schneider, F. Jahnke, S.W. Koch, W.W. Rühle, H.D. Wolf, D. Bernklau, H. Riechert - phys. stat. sol. (b) 204, 548

Transient four wave mixing experiments on GaN

R. Zimmermann, A. Euteneuer, J. Möbius, D. Weber, Martin R. Hofmann , W.W. Rühle, E.O. Göbel, B.K. Meyer, H. Amano, I. Akasaki - 2nd GaN workshop, Sophia Antipolis, France

Monolithic colliding pulse mode-locked semiconductor lasers

S. Bischoff, J. Mørk, T. Franck, S.D. Brorson, Martin R. Hofmann , K. Fröjdh, L. Prip, M.P. Sørensen - Journal of Quantum Semiclass. Opt. 9, 655 (1997) - invited

Spectrally and temporally resolved gain dynamics in mode locked semiconductor quantum well lasers

P. Miltenyi, M. Koch, Martin R. Hofmann , H. Jung, W. Elsäßer - Appl. Phys. Lett. 70, 1506

Chirp of monolithic colliding pulse mode-locked diode lasers

Martin R. Hofmann , S. Bischoff, T. Franck, L. Prip, S.D. Brorson, J. Mørk, K. Fröjdh - Appl. Phys. Lett. 70, 2514

Influence of carrier cooling on the emission dynamics of semiconductor microcavity lasers

M. Hilpert, Martin R. Hofmann , C. Ellmers, M. Oestreich, H.C. Schneider, F. Jahnke, S.W. Koch, W.W. Rühle, H.D. Wolf, D. Bernklau, H. Riechert - HCIS-10, Berlin, Deutschland

Temporal and spectral dynamics in Multiquantum well semiconductor saturable absorbers

Martin R. Hofmann , K. Fröjdh, S. D. Brorson, J. Mørk - IEEE Photon. Technol. Lett. 9, 622

Subpicosecond heterodyne four-wave mixing experiments on InGaAsP semiconductor laser amplifiers

Martin R. Hofmann , S.D. Brorson, J. Mørk, P. Skovgaard, J. McInerney, A. Mecozzi - Opt. Commun. 139, 117

Ultra-broadband chirped mirrors for femtosecond lasers

E.J. Mayer, J. Möbius, A. Euteneuer, Martin R. Hofmann , W.W. Rühle, A.P. Kovacs, A. Köházi-Kis, R. Szipöcs - CLEO/IQEQ, Baltimore, USA

1996
Pulse shape characterisation of colliding pulse modelocked laser diodes

T. Franck, Martin R. Hofmann , L. Prip, S. Bischoff, S.D. Brorson, J. Mørk - CLEO/IQEC, Anaheim, USA

Time resolved four wave mixing in semiconductor laser amplifiers

Martin R. Hofmann , S.D. Brorson, J. Mørk, A. Mecozzi - CLEO/IQEC, Anaheim, USA

Transient four-wave mixing with collinear pump and probe

A. Mecozzi, J. Mørk, Martin R. Hofmann - Opt. Lett. 21, 1017

Time resolved four-wave mixing technique to measure the ultrafast coherent dynamics in semiconductor optical amplifiers

Martin R. Hofmann , S.D. Brorson, J. Mørk, A. Mecozzi - Appl. Phys. Lett. 68, 3236

Modelling and characterization of colliding pulse modelocked (CPM) quantum well lasers

S. Bischoff, S.D. Brorson, T. Franck, Martin R. Hofmann , L. Prip, M.P. Sørensen, J. Mørk - SPIE Photonics West, OE/LASE San Jose, USA (invited)

Modelling and characterization of colliding pulse modelocked (CPM) quantum well lasers

S. Bischoff, S.D. Brorson, T. Franck, Martin R. Hofmann , L. Prip, M.P. Sørensen, J. Mørk - Proc. SPIE 2693, 477 (1996) Physics and Simulation of Optoelectronic Devices IV, Ed. W.W. Chow and M. Osinski

1995
Theory of coherent phenomena in pump - probe excitation of semiconductor amplifiers

A. Girndt, A. Knorr, Martin R. Hofmann , S.W. Koch - J. Appl. Phys. 78, 2946

Long-term stable mode locking of a visible diode laser with phase-conjugate feedback

E. Miltenyi, M.O. Ziegler, Martin R. Hofmann , J. Sacher, W. Elsäßer, E.O. Göbel, D.L. Mac Farlane - Optics Lett. 20, 734

Phase and amplitude stabitlity of an external cavity laser diode modelocked by optoelectronic feedback

M.O. Ziegler, Martin R. Hofmann , J. Sacher, W. Elsäßer, E.O. Göbel - Electron. Lett. 31, 371

Theoretical analysis of ultrafast pump - probe experiments in semiconductor amplifiers

A. Girndt, A. Knorr, Martin R. Hofmann , S.W. Koch - Appl. Phys. Lett. 66, 550

1994
High spectral tuning range of a modelocked InGaAs/InGaAsP MQW laser diode due to light hole gain contribution

Martin R. Hofmann , W. Weise, W. Elsäßer, E.O. Göbel - IEEE Photon. Technol. Lett. 6, 1306

Picosecond gain dynamics of an actively mode - locked external cavity laser diode

Martin R. Hofmann , M. Koch, J. Feldmann, W. Elsäßer, E.O. Göbel, W.W. Chow, S.W. Koch - IEEE J. Quantum Electron. 30, 1756

Femtosecond pump-probe experiments on semiconductor optical amplifiers

Martin R. Hofmann , M. Koch, J. Feldmann, W. Elsäßer, E.O. Göbel - International workshop on pattern singularities and collapse: Applications to semiconductor lasers and critical focusing of ultrashort pulses, Cork, Ireland (invited)

Temporal and spectral gain dynamics in an actively modelocked semiconductor laser

Martin R. Hofmann , M. Koch, H.-J. Heinrich, G. Weiser, J. Feldmann, W. Elsäßer, E.O. Göbel, W.W. Chow, S.W. Koch - IEEE Proc.-Optoelectron. 141, 127

Ultrafast gain dynamics in InGaAlP lasers

J.A. Tatum, Martin R. Hofmann , J. Sacher, D.L. Mac Farlane - OSA meeting, Dallas, USA

Verstärkungsdynamik modengekoppelter Laserdioden

Martin R. Hofmann - Philipps-Universität Marburg

Picosecond gain dynamics of an actively modelocked external cavity laser diode

Martin R. Hofmann , M. Koch, H.-J. Heinrich, G. Weiser, J. Feldmann, W. Elsäßer, E.O. Göbel, S.W. Koch, W.W. Chow - SPIE Photonics West, OE/LASE Los Angeles, USA (invited)

Picosecond gain dynamics of an actively modelocked external cavity laser diode

Martin R. Hofmann , M. Koch, H.-J. Heinrich, G. Weiser, J. Feldmann, W. Elsäßer, E.O. Göbel, S.W. Koch, W.W. Chow - Proc. SPIE 2146, 256 (1994) Physics and Simulation of Optoelectronic Devices II, Ed. W.W. Chow and M. Osinski

1993
Picosecond gain dynamics in an actively modelocked external cavity laser diode

Martin R. Hofmann , M. Koch, J. Feldmann, W. Elsäßer, E.O. Göbel - Semiconductor and integrated optoelectronics conference, Cardiff, Wales

Modelocking of interferometric Y-Lasers in an external cavity

Martin R. Hofmann , D. Baums, J. Sacher, W. Elsäßer, M. Schilling, W. Idler, K. Wünstel, E. Zielinski, O. Hildebrand - IEEE Photon. Technol. Lett. 5, 1135

1992
Dynamic mode switching of a RF modulated external cavity laser diode - Due to spectral hole burning

Martin R. Hofmann , J. Sacher, W. Elsäßer, E.O. Göbel - The 1992 European Semiconductor laser workshop, Potsdam

Mode locking of semiconductor lasers through optoelectronic feedback (OEFB)

Martin R. Hofmann , M. Ziegler, J. Sacher, W. Elsäßer, E.O. Göbel - Europ. Conf. on Opt. Commun., scientific exhibition, Berlin

Picosecond pulse generation in a GaAs/ GaAlAs single - quantum well laser at the first and second subband transition

W. Elsäßer, J. Sacher, F. Hackenbuchner, Martin R. Hofmann , E.O. Göbel, S. Schuster, T. Wicht, H. Haug, H. Jung, E. Schlosser - IEEE Photon. Technol. Lett. 4, 966

1991
Mode - locking of a GaAs/GaAlAs single quantum well laser at the second quantized state

W. Elsäßer, J. Sacher, F. Hackenbuchner, Martin R. Hofmann , E.O. Göbel - Europ. Conf. on Quantum Electron., Edinburgh

Erzeugung von Pikosekunden - Lichtimpulsen mit Halbleiterlasern

E.O. Göbel, W. Elsäßer, J. Sacher, Martin R. Hofmann , F. Hackenbuchner - Hannovermesse Industrie, Hannover

Output characteristics of RF-modulated laser diodes

T. Wicht, S. Schuster, H. Haug, J. Sacher, Martin R. Hofmann , W. Elsäßer, E.O. Göbel - IEEE J. Quantum Electron 27, 1682