Prof. Martin Koch Profile

Prof. Martin Koch

at Philipps-Univ Marburg

SPIE Involvement:

Author

Publications (38)

SPIE Journal Paper | 10 November 2022

Characterization of terahertz wavefront aberrations using computational shear-interferometry

Mostafa Agour, Claas Falldorf, Fatima Taleb, Enrique Castro-Camus, Martin Koch, Ralf Bergmann

OE, Vol. 61, Issue 11, 114102, (November 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.11.114102

KEYWORDS: Terahertz radiation, Wavefronts, Spherical lenses, Diffraction gratings, Cameras, Diffraction, Wavefront aberrations, Sensors, Interferometers, Monochromatic aberrations

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Proceedings Article | 31 May 2022 Presentation + Paper

Shear interferometry for terahertz wavefront sensing

Mostafa Agour, Claas Falldorf, Fatima Taleb, Enrique Castro-Camus, Martin Koch, Ralf Bergmann

Proceedings Volume 12134, 121340B (2022) https://doi.org/10.1117/12.2621696

KEYWORDS: Terahertz radiation, Cameras, Wavefronts, Spherical lenses, Diffraction gratings, Diffraction, Wavefront sensors, Sensors, Interferometers, Wave propagation

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Proceedings Article | 4 March 2019 Paper

Investigations on the origins of self-mode-locking in vertical-external-cavity surface-emitting-lasers: nonlinear lensing and the role of the microcavity

Christian Kriso, Sascha Kress, Tasnim Munshi, Marius Großmann, Roman Bek, Michael Jetter, Peter Michler, Wolfgang Stolz, Martin Koch, Arash Rahimi-Iman

Proceedings Volume 10901, 109010H (2019) https://doi.org/10.1117/12.2510373

KEYWORDS: Mode locking, Refractive index, Optical microcavities, Nonlinear optics, Semiconductors, Ultrafast phenomena, Kerr effect, Absorption, Refraction

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Proceedings Article | 21 September 2017 Presentation

Field-induced exciton and CT-state dissociation probed by time-resolved luminescence quenching (Conference Presentation)

Uli Lemmer, Marina Gerhard, Andreas Arndt, Martin Koch, Ian Howard

Proceedings Volume 10348, 103480L (2017) https://doi.org/10.1117/12.2274345

KEYWORDS: Excitons, Luminescence, Solar cells, Interfaces, Data modeling, Organic photovoltaics, Organic semiconductors, Heterojunctions, Near infrared, Temperature metrology

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Proceedings Article | 21 April 2017 Presentation

The development and fundamental analysis of type-II VECSELs at 1.2 µm (Conference Presentation)

Christoph Möller, Christian Fuchs, Christian Berger, Fan Zhang, Arash Rahimi-Iman, Martin Koch, Antje Ruiz Perez, Stephan Koch, Jörg Hader, Jerome Moloney, Wolfgang Stolz

Proceedings Volume 10087, 100870L (2017) https://doi.org/10.1117/12.2252882

KEYWORDS: Quantum dots, Fluctuations and noise, Nonlinear control, Vertical external cavity surface emitting lasers, Current controlled current source, Quantum wells, Ultraviolet radiation, Gallium arsenide, Heterojunctions

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Proceedings Article | 21 April 2017 Presentation

Towards self-mode locking of AlGaInP-VECSELs (Conference Presentation)

Roman Bek, Quynh Duong-Ederer, Max Vaupel, Hermann Kahle, Thomas Schwarzbäck, Arash Rahimi-Iman, Michael Jetter, Martin Koch, Peter Michler

Proceedings Volume 10087, 100870N (2017) https://doi.org/10.1117/12.2252473

KEYWORDS: Indium gallium phosphide, Mode locking, Pulsed laser operation, Semiconductors, Semiconductor lasers, Kerr effect, Mirrors, Femtosecond phenomena, Laser systems engineering, Epitaxy

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Proceedings Article | 10 November 2016 Presentation

Identifying interfacial charge transfer states in organic heterostructures (Conference Presentation)

Andreas Arndt, Marina Gerhard, Ian Howard, Martin Koch, Ulrich Lemmer

Proceedings Volume 9923, 99231G (2016) https://doi.org/10.1117/12.2238126

KEYWORDS: Excitons, Heterojunctions, Organic photovoltaics, Interfaces, Anisotropy, Luminescence, Near infrared, Polymers, Chemistry, Nanomaterials

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Proceedings Article | 27 April 2016 Paper

Loss mechanisms in organic solar cells based on perylene diimide acceptors studied by time-resolved photoluminescence

Marina Gerhard, Dominik Gehrig, Ian Howard, Andreas Arndt, Mühenad Bilal, Arash Rahimi-Iman, Uli Lemmer, Frédéric Laquai, Martin Koch

Proceedings Volume 9895, 98950H (2016) https://doi.org/10.1117/12.2227672

KEYWORDS: Polymers, Excitons, Organic photovoltaics, Luminescence, Solar cells, Molecules, Picosecond phenomena, Solar energy, Diffusion, Fullerenes, Absorption, Interfaces

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Proceedings Article | 10 March 2016 Paper

Self-mode-locked vertical-external-cavity surface-emitting laser

Arash Rahimi-Iman, Mahmoud Gaafar, Christoph Möller, Max Vaupel, Fan Zhang, Dalia Al-Nakdali, Ksenia Fedorova, Wolfgang Stolz, Edik Rafailov, Martin Koch

Proceedings Volume 9734, 97340M (2016) https://doi.org/10.1117/12.2216469

KEYWORDS: Semiconductor lasers, Semiconductors, Mode locking, Disk lasers, Laser optics, Ultrafast phenomena, Optical semiconductors, Mirrors, Quantum wells, Pulsed laser operation, Refractive index, Continuous wave operation

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Proceedings Article | 10 March 2016 Paper

A serially-connected two-chip VECSEL for dual-wavelength emission with high intracavity power

Fan Zhang, Mahmoud Gaafar, Christoph Möller, Wolfgang Stolz, Martin Koch, Arash Rahimi-Iman

Proceedings Volume 9734, 973414 (2016) https://doi.org/10.1117/12.2211607

KEYWORDS: Semiconductor lasers, Disk lasers, Continuous wave operation, Semiconductors, Wavelength tuning, High power lasers, Laser applications, Frequency conversion, Terahertz sources, Mirrors, Second-harmonic generation, Crystals, Optical filters, Terahertz radiation, Quantum wells, Dispersion, Nonlinear crystals

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Proceedings Article | 5 October 2015 Presentation

Charge transfer states as traps in organic solar cells (Presentation Recording)

Andreas Arndt, Marina Gerhard, Aina Quintilla, Ian Howard, Martin Koch, Uli Lemmer

Proceedings Volume 9567, 95670P (2015) https://doi.org/10.1117/12.2186543

KEYWORDS: Near infrared, Solar cells, Luminescence, Excitons, Organic photovoltaics, Temperature metrology, Heterojunctions, Video, Current controlled current source

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Proceedings Article | 16 March 2015 Paper

Time-resolved spectroscopy of charge transfer phenomena in organic solar cells

Marina Gerhard, Andreas Arndt, Aina Quintilla, Arash Rahimi-Iman, Uli Lemmer, Martin Koch

Proceedings Volume 9360, 936010 (2015) https://doi.org/10.1117/12.2076138

KEYWORDS: Picosecond phenomena, Excitons, Polymers, Solar cells, Ultrafast phenomena, Absorption, Luminescence, Organic photovoltaics, Diffusion, Fullerenes

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Proceedings Article | 13 March 2015 Paper

Efficiency droop in nitride LEDs revisited: impact of excitonic recombination processes

A. Hangleiter, Torsten Langer, Marina Gerhard, Dimitry Kalincev, A. Kruse, Heiko Bremers, U. Rossow, M. Koch

Proceedings Volume 9363, 93631R (2015) https://doi.org/10.1117/12.2078803

KEYWORDS: Quantum wells, Light emitting diodes, Luminescence, Gallium nitride, Data modeling, Electrons, Absorption, Excitons, Physics, Temperature metrology

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Proceedings Article | 4 March 2015 Paper

Recent advances in the field of vertical-external-cavity surface-emitting lasers

Arash Rahimi-Iman, Mahmoud Gaafar, Dalia Al Nakdali, Christoph Möller, Fan Zhang, Matthias Wichmann, Mohammad Shakfa, Ksenia Fedorova, Wolfgang Stolz, Edik Rafailov, Martin Koch

Proceedings Volume 9349, 934906 (2015) https://doi.org/10.1117/12.2079182

KEYWORDS: Mode locking, Quantum wells, Mirrors, Semiconductor lasers, Pulsed laser operation, Second-harmonic generation, Picosecond phenomena, Semiconductors, Diamond, Frequency conversion

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Proceedings Article | 3 March 2014 Paper

Systematic investigation of single- and multi-mode operation in vertical-external-cavity surface-emitting lasers

M. Wichmann, M. Shakfa, M. Scheller, A. Rahimi-Iman, B. Heinen, J. Moloney, S. Koch, M. Koch

Proceedings Volume 8966, 89660N (2014) https://doi.org/10.1117/12.2037871

KEYWORDS: Resonators, Fabry–Perot interferometers, Streak cameras, Interferometry, Terahertz radiation, Mirrors, Output couplers, Optical filters, Laser damage threshold, Interferometers

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Proceedings Article | 8 November 2012 Paper

Power scaling of high-power optically pumped semiconductor lasers for continuous wave and ultrashort pulse generation

Alexandre Laurain, Maik Scheller, Tsuei-Lian Wang, Jorg Hader, Jerome Moloney, Stephan Koch, Bernd Heinen, Martin Koch, Bernardette Kunert, Wolfgang Stolz

Proceedings Volume 8547, 85470I (2012) https://doi.org/10.1117/12.976979

KEYWORDS: Mode locking, Diamond, Semiconductors, Mirrors, Quantum wells, Semiconductor lasers, High power lasers, Ultrafast phenomena, Continuous wave operation, Diodes

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Proceedings Article | 15 February 2012 Paper

VECSELs: non-equilibrium effects and two-color operation

M. Wichmann, A. Chernikov, M. Shakfa, A. Bäumner, M. Koch, M. Scheller, J. Hader, J. Moloney, S. Koch

Proceedings Volume 8242, 82420I (2012) https://doi.org/10.1117/12.910273

KEYWORDS: Glasses, Streak cameras, Mirrors, Scattering, Polarization, Quantum wells, Laser scattering, Statistical analysis, Hole burning spectroscopy, Semiconductor lasers

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Proceedings Article | 17 September 2009 Paper

Handheld terahertz spectrometer for the detection of liquid explosives

N. Krumbholz, C. Jansen, M. Scheller, T. Müller-Wirts, S. Lübbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. von Chrzanowski, U. Ewert, M. Koch

Proceedings Volume 7485, 748504 (2009) https://doi.org/10.1117/12.830381

KEYWORDS: Antennas, Liquids, Spectroscopy, Terahertz radiation, Refractive index, Fiber lasers, Dispersion, Explosives, Indium gallium arsenide, Water

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Proceedings Article | 24 February 2009 Paper

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 Hofmann

Proceedings Volume 7197, 71970B (2009) https://doi.org/10.1117/12.807853

KEYWORDS: Terahertz radiation, Semiconductor lasers, Sensors, Continuous wave operation, Laser systems engineering, Diffraction, Diffraction gratings, Mirrors, Femtosecond phenomena, Mode locking

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SPIE Journal Paper | 1 March 2008

Detection of foreign bodies in chocolate with pulsed terahertz spectroscopy

Christian Jördens, Martin Koch

OE, Vol. 47, Issue 03, 037003, (March 2008) https://doi.org/10.1117/12.10.1117/1.2896597

KEYWORDS: Contamination, Glasses, Terahertz radiation, Refractive index, Particles, Millimeter wave imaging, Image transmission, Metals, Image processing, Terahertz spectroscopy

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Proceedings Article | 8 February 2008 Paper

Applications of terahertz spectroscopy in the plastics industry

S. Wietzke, F. Rutz, C. Jördens, N. Krumbholz, N. Vieweg, C. Jansen, R. Wilk, M. Koch

Proceedings Volume 6840, 68400V (2008) https://doi.org/10.1117/12.757547

KEYWORDS: Terahertz radiation, Polymers, Spectroscopy, Refractive index, Nondestructive evaluation, Terahertz spectroscopy, Reflectors, Process control, Lenses, Control systems

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Proceedings Article | 18 June 2007 Paper

Inspection of plastic weld joints with terahertz imaging

S. Wietzke, N. Krumbholz, C. Jördens, B. Baudrit, M. Bastian, M. Koch

Proceedings Volume 6616, 66163N (2007) https://doi.org/10.1117/12.724739

KEYWORDS: Terahertz radiation, Polymers, Nondestructive evaluation, Metals, Contamination, Inspection, Absorption, Image transmission, Solids, Antennas

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Proceedings Article | 18 June 2007 Paper

Fiber-coupled THz spectroscopy for monitoring polymeric compounding processes

N. Vieweg, N. Krumbholz, T. Hasek, R. Wilk, V. Bartels, C. Keseberg, V. Pethukhov, M. Mikulics, L. Wetenkamp, M. Koch

Proceedings Volume 6616, 66163M (2007) https://doi.org/10.1117/12.724884

KEYWORDS: Antennas, Terahertz radiation, Polymers, Spectroscopy, Metals, Sensors, Optical amplifiers, Adhesives, Fiber amplifiers, Switches

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Proceedings Article | 3 February 2007 Paper

A fluid sensor based on a sub-terahertz photonic crystal waveguide

T. Hasek, H. Kurt, D. Citrin, M. Koch

Proceedings Volume 6480, 64801I (2007) https://doi.org/10.1117/12.708481

KEYWORDS: Photonic crystals, Waveguides, Refractive index, Sensors, Liquids, Microfluidics, Finite-difference time-domain method, Polarization, Optical fibers, Network security

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Proceedings Article | 19 May 2006 Paper

Mail inspection using THz imaging: a comparison of three different systems

K. Baaske, M. Salhi, F. Rutz, T. Hasek, R. Wilk, H. Richter, M. Koch

Proceedings Volume 6212, 62120U (2006) https://doi.org/10.1117/12.665238

KEYWORDS: Terahertz radiation, Imaging systems, Antennas, Absorption, Microwave radiation, Gas lasers, Inspection, Spectroscopy, Metals, Laser systems engineering

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Proceedings Article | 19 April 2006 Paper

Semi-confocal imaging with a THz gas laser

Mohammed Salhi, Martin Koch

Proceedings Volume 6194, 61940A (2006) https://doi.org/10.1117/12.662024

KEYWORDS: Terahertz radiation, Gas lasers, Confocal microscopy, Sensors, Quantum cascade lasers, Microscopes, Carbon monoxide, Signal detection, Resonators, Laser resonators

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Proceedings Article | 19 April 2006 Paper

Improved dielectric mirrors for the THz frequency range

F. Rutz, N. Krumbholz, L. Micele, G. de Portu, D. Mittleman, M. Koch

Proceedings Volume 6194, 61940K (2006) https://doi.org/10.1117/12.661610

KEYWORDS: Terahertz radiation, Mirrors, Dielectric mirrors, Refractive index, Silicon, Ceramics, Microresonators, Dielectrics, Antennas, Absorption

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Proceedings Article | 19 April 2006 Paper

A numerical study of photoconductive dipole antennas: the real emission frequency and an improved antenna design

K. Ezdi, M. Islam, Y. A. N. Reddy, C. Jördens, A. Enders, M. Koch

Proceedings Volume 6194, 61940G (2006) https://doi.org/10.1117/12.662010

KEYWORDS: Antennas, Resistance, Electrons, Continuous wave operation, Pulsed laser operation, Semiconductors, Gallium arsenide, Terahertz radiation, Free space, Advanced distributed simulations

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Proceedings Article | 25 March 2005 Paper

Experimental and theoretical study of the THz absorption spectra of selected tripeptides

Frank Rutz, R. Wilk, T. Kleine-Ostmann, J. Grunenberg, Martin Koch

Proceedings Volume 5727, (2005) https://doi.org/10.1117/12.590532

KEYWORDS: Terahertz radiation, Absorption, Molecules, Spectroscopy, Terahertz spectroscopy, Hydrogen, Ions, Proteins, Magnesium, Chemical species

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Proceedings Article | 25 March 2005 Paper

THz channel characterization for future wireless gigabit indoor communication systems

Radoslaw Piesiewicz, Jaouhar Jemai, Martin Koch, Thomas Kurner

Proceedings Volume 5727, (2005) https://doi.org/10.1117/12.588555

KEYWORDS: Terahertz radiation, Telecommunications, Antennas, Receivers, Signal attenuation, Wireless communications, Mirrors, Dielectric mirrors, Reflectivity, Monte Carlo methods

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Proceedings Article | 25 March 2005 Paper

Quality control of polymeric compounds using terahertz imaging

Frank Rutz, Martin Koch, Shilpa Khare, Martin Moneke

Proceedings Volume 5727, (2005) https://doi.org/10.1117/12.590301

KEYWORDS: Terahertz radiation, Polymers, Particles, Absorption, Silver, Transmission electron microscopy, Terahertz spectroscopy, Spectroscopy, Antennas, Photography

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Proceedings Article | 29 December 2004 Paper

Room-temperature semiconductor modulators for free-space signal transmission with THz waves

Thomas Kleine-Ostmann, Klaus Pierz, Günter Hein, Philip Dawson, Martin Koch

Proceedings Volume 5593, (2004) https://doi.org/10.1117/12.569576

KEYWORDS: Terahertz radiation, Modulators, Modulation, Signal detection, Capacitance, Sensors, Gallium arsenide, Chromium, Picosecond phenomena, Semiconductors

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Proceedings Article | 8 April 2004 Paper

Ultrafast polarization dynamics in optically excited biased quantum wells

Dmitry Turchinovich, Boris Monozon, Martin Koch, Sandra Lahmann, Uwe Rossow, Andreas Hangleiter, Peter Jepsen

Proceedings Volume 5354, (2004) https://doi.org/10.1117/12.537783

KEYWORDS: Quantum wells, Terahertz radiation, Polarization, Absorption, Photons, Capacitors, Ultrafast phenomena, Femtosecond phenomena, Ocean optics, Pulsed laser operation

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Proceedings Article | 12 June 2002 Paper

Semiconductor laser with simultaneous tunable dual-wavelength emission

Martin Breede, Tilman Hoener zu Siederdissen, Josef Kovacs, Jens Struckmeier, Joerg Zimmermann, Stefan Hoffmann, Martin Hofmann, Thomas Kleine-Ostmann, Pascal Knobloch, Martin Koch, Jan-Peter Meyn

Proceedings Volume 4646, (2002) https://doi.org/10.1117/12.470546

KEYWORDS: Semiconductor lasers, Terahertz radiation, Mirrors, Spectral resolution, Tunable lasers, LCDs, Diodes, Digital micromirror devices, Second-harmonic generation, Diffraction gratings

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Proceedings Article | 11 December 2001 Paper

THz time-domain spectroscopy on 4-(trans-4'-pentylcyclohexyl)-benzonitril

Dmitry Turchinovich, Pascal Knobloch, Georg Luessem, Martin Koch

Proceedings Volume 4463, (2001) https://doi.org/10.1117/12.449955

KEYWORDS: Terahertz radiation, Liquid crystals, Spectroscopy, Absorption, Antennas, Refractive index, Birefringence, Molecules, Visible radiation, Pulsed laser operation

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Proceedings Article | 24 October 2001 Paper

THz imaging of histo-pathological samples

Pascal Knobloch, K. Schmalstieg, Martin Koch, E. Rehberg, F. Vauti, K. Donhuijsen

Proceedings Volume 4434, (2001) https://doi.org/10.1117/12.446686

KEYWORDS: Terahertz radiation, Tissues, Absorption, Antennas, Cartilage, Liver, Spatial resolution, Tissue optics, Spectroscopy, X-rays

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Proceedings Article | 9 September 1999 Paper

THz imaging: fundamentals and biological applications

Martin Koch

Proceedings Volume 3828, (1999) https://doi.org/10.1117/12.361035

KEYWORDS: Terahertz radiation, Water, Spectroscopy, Antennas, Absorption, Near field optics, Sensors, Veins, Materials science, Thermography

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Proceedings Article | 30 June 1994 Paper

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

Martin Hofmann, M. Koch, H.-J. Heinrich, Gerhard Weiser, Jochen Feldmann, Wolfgang Elsaesser, Ernst Goebel, Stephan Koch, Weng Chow

Proceedings Volume 2146, (1994) https://doi.org/10.1117/12.178516

KEYWORDS: Semiconductor lasers, Modulation, Mode locking, Picosecond phenomena, Sapphire lasers, Diodes, Optical pumping, Streak cameras, Laser beam diagnostics, Temporal resolution

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Showing 5 of 38 publications

Conference Committee Involvement (2)

Terahertz and Ultrashort Electromagnetic Pulses for Biomedical Applications

2 February 2014 | San Francisco, California, United States

Terahertz and Ultrashort Electromagnetic Pulses for Biomedical Applications

6 February 2013 | San Francisco, California, United States

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