Dr. Carsten Brenner Profile

Dr. Carsten Brenner

at Ruhr Univ Bochum

SPIE Involvement:

Author

Publications (29)

Proceedings Article | 13 March 2024 Presentation + Paper

Investigation of passive mode-locking and self-mode-locking in two-section monolithic QD and QW lasers

Navina Kleemann, Nils Surkamp, Philipp Scherer, Rejdi Gjoni, Carsten Brenner, Marcel van Delden, Martin Moehrle, Martin Hofmann

Proceedings Volume 12905, 129050R (2024) https://doi.org/10.1117/12.3000196

KEYWORDS: Quantum dot lasers, Autocorrelation, Mode locking, Semiconductor lasers, Quantum wells, Pulsed laser operation

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Proceedings Article | 11 March 2024 Presentation + Paper

Dispersive mirrors for phase delay variation in THz-homodyne systems

Lisa Kreuzer, Nils Surkamp, Niklas Schulz, Valentin Wittwer, Martin Hoffmann, Thomas Südmeyer, Carsten Brenner, Milan Deumer, Robert Kohlhaas, Martin Hofmann

Proceedings Volume 12885, 128850Q (2024) https://doi.org/10.1117/12.2692885

KEYWORDS: Mirrors, Terahertz radiation, Laser frequency, Phase shifts, Phase shift keying, Phase modulation, Homodyne detection, Phase recovery, Data acquisition

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Proceedings Article | 31 May 2022 Presentation + Paper

THz metrology with monolithic tunable two-color diode lasers

Martin Hofmann, Nils Surkamp, Alexandra Gerling, James O'Gorman, Martin Honsberg, Sebastian Schmidtmann, Uttam Nandi, Sascha Preu, Joachim Sacher, Carsten Brenner

Proceedings Volume 12134, 1213408 (2022) https://doi.org/10.1117/12.2626219

KEYWORDS: Terahertz radiation, Semiconducting wafers, Semiconductor lasers, Principal component analysis, Silicon, Refractive index, Receivers, Photonics, Metrology, Fabry–Perot interferometers

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Proceedings Article | 7 March 2022 Poster + Presentation + Paper

Tuning of optical coherence tomography texture features as a basis for tissue differentiation in glioblastoma samples

Jens Möller, Eveline Popanda, Iris Tischoff, Nuri Aydin, Hubert Welp, Carsten Brenner, Nils Gerhardt, Kirsten Schmieder, Dorothea Miller, Martin Hofmann

Proceedings Volume 11948, 119480L (2022) https://doi.org/10.1117/12.2609402

KEYWORDS: Tissues, Optical coherence tomography, Tumors, Feature extraction, Image classification, Transparency, Image quality, Tissue optics, Image segmentation, Natural surfaces

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Proceedings Article | 4 March 2022 Presentation + Paper

Slotted Y-branch laser for cw-THz thickness measurements at 1 THz

Nils Surkamp, Alexandra Gerling, James O'Gorman, Martin Honsberg, Sebastian Schmidtmann, Uttam Nandi, Sascha Preu, Joachim Sacher, Carsten Brenner, Martin Hofmann

Proceedings Volume 12021, 1202104 (2022) https://doi.org/10.1117/12.2609787

KEYWORDS: Semiconducting wafers, Terahertz radiation, Refractive index, Silicon, Spectroscopy, Fabry–Perot interferometers

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Proceedings Article | 5 March 2021 Presentation

Passive- and self- mode-locking based ultrashort pulse generation in monolithic diode laser at 1550 nm

Ali Alloush, Navina Kleemann, Lukas Braun, Carsten Brenner, Marlene Zander, Wolfgang Rehbein, Martin Moehrle, Martin R. Hofmann

Proceedings Volume 11705, 1170509 (2021) https://doi.org/10.1117/12.2583134

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Proceedings Article | 5 March 2021 Presentation + Paper

Reduction of surface morphology influence on THz reflection time domain spectroscopy for material classification by using multiple observation angles

Lennart Becke, Alexandra Gerling, Martin Hofmann, Carsten Brenner

Proceedings Volume 11685, 1168507 (2021) https://doi.org/10.1117/12.2577607

KEYWORDS: Reflection, Reflectance spectroscopy, Terahertz radiation, Spectroscopy, Transmitters, Time metrology, Specular reflections, Signal to noise ratio, Principal component analysis, Machine learning

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Proceedings Article | 22 April 2020 Paper

Self-mode-locking and chirp compensation in an external cavity diode laser at 1550 nm

Ali Alloush, Amer Bassal, Carsten Brenner, Catherine Fortin, Karim Mekhazni, Piero Gamarra, Cosimo Calò, Martin Hofmann

Proceedings Volume 11356, 113560H (2020) https://doi.org/10.1117/12.2555946

KEYWORDS: Dispersion, Semiconductor lasers, Ultrafast phenomena, Mode locking, Picosecond phenomena, Single mode fibers, Molybdenum, Autoregressive models, Alternate lighting of surfaces, Semiconductors

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Proceedings Article | 24 February 2020 Paper

Comparison of self-mode-locking in monolithic and external cavity diode laser at 1550 nm

M. Ali Alloush, Amer Bassal, Carsten Brenner, Catherine Fortin, Karim Mekhazni, Piero Gamarra, Cosimo Calo, Martin Hofmann

Proceedings Volume 11301, 113011T (2020) https://doi.org/10.1117/12.2545780

KEYWORDS: Dispersion, Semiconductor lasers, Ultrafast phenomena, Molybdenum, Picosecond phenomena, Electrocardiography, Mode locking, Single mode fibers, Alternate lighting of surfaces, Semiconductors

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SPIE Journal Paper | 9 April 2019 Open Access

Transducer-matched multipulse excitation for signal-to-noise ratio improvement in diode laser-based photoacoustic systems

Maxim Cherkashin, Carsten Brenner, Martin Hofmann

JBO, Vol. 24, Issue 04, 046001, (April 2019) https://doi.org/10.1117/12.10.1117/1.JBO.24.4.046001

KEYWORDS: Transducers, Signal to noise ratio, Photoacoustic spectroscopy, Semiconductor lasers, Diodes, Laser systems engineering, Pulsed laser operation, Signal detection, Copper, Ultrasonics

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Proceedings Article | 1 March 2019 Paper

Mode-locked diode lasers for THz asynchronous optical sampling

N. Surkamp, B. Döpke, C. Brenner, K. Orend, C. Baer, T. Musch, T. Prziwarka, A. Klehr, A. Knigge, M. Hofmann

Proceedings Volume 10917, 109171C (2019) https://doi.org/10.1117/12.2508396

KEYWORDS: Semiconductor lasers, Terahertz radiation, Mode locking, Pulsed laser operation, Frequency modulation, Antennas, Optical amplifiers, Modulation, Laser systems engineering

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Proceedings Article | 14 May 2018 Paper

Compact continuous wave THz source based on monolithic two-color laser diode

Jared Ombiro Gwaro, Carsten Brenner, Bernd Sumpf, Andreas Klehr, Jörg Fricke, Martin Hofmann

Proceedings Volume 10684, 106841Y (2018) https://doi.org/10.1117/12.2306866

KEYWORDS: Terahertz radiation, Antennas, Semiconductor lasers, Continuous wave operation, Signal detection, Nondestructive evaluation, Distributed Bragg reflectors

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Proceedings Article | 9 May 2018 Paper

Mode-locked diode laser with resonant ring amplifier

M. Ali Alloush, Rouven Pilny, Carsten Brenner, Thomas Prziwarka, Andreas Klehr, Andrea Knigge, Günther Tränkle, Martin Hofmann

Proceedings Volume 10682, 106820N (2018) https://doi.org/10.1117/12.2307220

KEYWORDS: Optical amplifiers, Semiconductor lasers, Amplifiers, Mode locking, Oscillators, Ultrafast phenomena, Resonators

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We present a ring semiconductor amplifier system which is seeded by ultrashort pulses for additive amplification. An external cavity diode laser configuration is built to generate the ultrashort pulses based on a hybrid modelocking scheme. A monolithic multi-segment diode laser is utilized as a light source in the operating oscillator. It has the advantage that the gain and absorber are integrated on one chip. The oscillator operates at a fundamental repetition-rate of 206MHz and can be driven on various harmonics of this frequency. The generated pulses are injected into a tapered amplifier (TA) which consists of a ridge waveguide section (RWS) for coupling and a tapered section (TS) for amplification. The amplified pulses are coupled back after amplification towards the TAs RWS forming a ring resonator setup. By matching the cavity lengths of the oscillator and ring resonator, we can obtain additively amplified pulses. The emission spectrum of the chosen TA is centered around 850nm which is in the wavelength range of the oscillator. The spectrum of the additively amplified pulses is observed for different pumping parameters of the TA using an optical spectrum analyzer. Additionally, we characterized the system for the best seeding parameters by monitoring the output signal with an autocorrelator. We figured out that the best performance is achieved when the amplifier is seeded by pulses at the second harmonic of 412 MHz. When blocking the seeding pulses the amplifier operates in continuous wave (CW) regime. By comparing the obtained spectra for CW and additively amplified pulses, we conclude that the system operates with a CW background also in pulsed operation. However, from the comparison of the spectra, we estimate that the amplified pulsed power is about 120mW for a seed power of 1:1mW. Thus, the ring amplifier provides a significantly higher amplification than a single pass amplifier. In future work the CW background has to be suppressed, e.g. by synchronous modulation of the current into the amplifiers ridge waveguide section.

Proceedings Article | 19 February 2018 Paper

Passive, active, and hybrid mode-locking in a self-optimized ultrafast diode laser

M. Ali Alloush, Rouven Pilny, Carsten Brenner, Andreas Klehr, Andrea Knigge, Günther Tränkle, Martin Hofmann

Proceedings Volume 10553, 105530N (2018) https://doi.org/10.1117/12.2290086

KEYWORDS: Mode locking, Semiconductor lasers, Spatial light modulators, Ultrafast phenomena, Evolutionary algorithms, Diodes, Pulsed laser operation, Laser resonators

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Proceedings Article | 13 March 2017 Paper

Linking transducer transfer function with multi-pulse excitation photoacoustic response

Maxim Cherkashin, Carsten Brenner, Widodo Putro, Benjamin Döpke, Nils Gerhardt, Martin Hofmann

Proceedings Volume 10139, 101391J (2017) https://doi.org/10.1117/12.2254577

KEYWORDS: Transducers, Photoacoustic imaging, Acoustics, Semiconductor lasers, Diodes, Light sources, Sensors, Imaging systems, Neptunium, Americium, Signal attenuation, Solid state lasers, Laser systems engineering

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Proceedings Article | 3 March 2017 Presentation + Paper

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

Maxim Cherkashin, Carsten Brenner, Widodo Putro, Benjamin Döpke, Nils Gerhardt, Martin Hofmann

Proceedings Volume 10064, 100641Q (2017) https://doi.org/10.1117/12.2253051

KEYWORDS: Transducers, Semiconductor lasers, Signal to noise ratio, Diodes, Photoacoustic imaging, Ultrasonography, Laser sources, Pulsed laser operation, Americium, Signal detection, Data acquisition

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Proceedings Article | 20 February 2017 Paper

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 Gerhardt, Martin Hofmann

Proceedings Volume 10110, 101101F (2017) https://doi.org/10.1117/12.2250912

KEYWORDS: Microcontrollers, Confocal microscopy, Laser optics, Microscopy, Multimodal imaging, Confocal laser scanning microscopy, Near infrared, Integrated circuits, Semiconductors, Laser scanners, Laser damage threshold, Microscopes, Single mode fibers, Reflectivity

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Proceedings Article | 4 May 2016 Paper

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, Martin Hofmann

Proceedings Volume 9899, 98992M (2016) https://doi.org/10.1117/12.2228070

KEYWORDS: Raman spectroscopy, Spectroscopy, Principal component analysis, Pattern recognition, Detection and tracking algorithms, Raman spectroscopy, Spectroscopy, Magnesium, Ocean optics, Visualization, Data processing, Spectrometers

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Proceedings Article | 15 March 2016 Paper

Dynamics of double-pulse photoacoustic excitation

Maxim Cherkashin, Carsten Brenner, Lena Göring, Benjamin Döpke, Nils Gerhardt, Martin Hofmann

Proceedings Volume 9708, 97084C (2016) https://doi.org/10.1117/12.2213476

KEYWORDS: Transducers, Photoacoustic microscopy, Semiconductor lasers, Photoacoustic imaging, Data processing, Data modeling, Data analysis, Glasses, Oscilloscopes, Signal detection

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Proceedings Article | 7 March 2016 Paper

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

Benjamin Döpke, Rouven Pilny, Heiko Horstkemper, Carsten Brenner, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin Hofmann

Proceedings Volume 9767, 97670N (2016) https://doi.org/10.1117/12.2213042

KEYWORDS: Mode locking, Semiconductor lasers, Ultrafast phenomena, Solid state lasers, Solid state electronics, Fiber lasers, Edge emitting semiconductor lasers, Frequency combs, Semiconductors, Resonators, Optical resonators, Pulsed laser operation, Mirrors, Laser optics, Waveguides

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Proceedings Article | 7 March 2016 Paper

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

Rouven Pilny, Benjamin Döpke, Jan Balzer, Carsten Brenner, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin Hofmann

Proceedings Volume 9767, 97670O (2016) https://doi.org/10.1117/12.2212906

KEYWORDS: Semiconductor lasers, Mode locking, Pulse shaping, Semiconductors, Ultrafast phenomena, Femtosecond phenomena, Edge emitting semiconductor lasers, Spatial light modulators, Diodes, Evolutionary algorithms, Resonators, Laser resonators

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Proceedings Article | 16 July 2015 Paper

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

Maxim Cherkashin, Carsten Brenner, Lena Göring, Benjamin Döpke, Nils Gerhardt, Martin Hofmann

Proceedings Volume 9539, 95390M (2015) https://doi.org/10.1117/12.2183957

KEYWORDS: Semiconductor lasers, Photoacoustic spectroscopy, Transducers, Photoacoustic microscopy, Signal detection, Photoacoustic tomography, Nd:YAG lasers, Photodiodes, Signal to noise ratio, Oscilloscopes

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Proceedings Article | 10 March 2015 Paper

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

Benjamin Döpke, Jan Balzer, Rouven Pilny, Carsten Brenner, Andreas Klehr, Götz Erbert, Günther Tränkle, Martin Hofmann

Proceedings Volume 9382, 93820D (2015) https://doi.org/10.1117/12.2079040

KEYWORDS: Semiconductor lasers, Pulse shaping, Mode locking, Pulsed laser operation, Spatial light modulators, Resonators, Mirrors, Signal processing, Ultrafast phenomena, Laser resonators

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Proceedings Article | 15 June 2011 Paper

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

Claus-Stefan Friedrich, Martin Mienkina, Carsten Brenner, Nils Gerhardt, Manfred Jörger, Andreas Strauß, Martin Beckmann, Georg Schmitz, Martin Hofmann

Proceedings Volume 8088, 808814 (2011) https://doi.org/10.1117/12.889682

KEYWORDS: Blood, Photoacoustic spectroscopy, Oxygen, Semiconductor lasers, Signal detection, Laser systems engineering, Signal generators, Signal attenuation, Absorption, Transducers

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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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Proceedings Article | 18 June 2007 Paper

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

Michael Breede, Christoph Kasseck, Carsten Brenner, Nils Gerhardt, Roland Höfling, Martin Hofmann

Proceedings Volume 6616, 66160R (2007) https://doi.org/10.1117/12.726825

KEYWORDS: Mirrors, Optical coherence tomography, Semiconductor lasers, Micromirrors, Digital micromirror devices, Tunable lasers, Light sources, Modulation, Diffraction gratings, Laser resonators

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Proceedings Article | 19 April 2006 Paper

Room temperature terahertz generation with semiconductor lasers

Carsten Brenner, Ngoc Tuyen, Stefan Hoffmann, Martin Hofmann

Proceedings Volume 6194, 61940H (2006) https://doi.org/10.1117/12.661909

KEYWORDS: Terahertz radiation, Semiconductor lasers, Optical amplifiers, Modes of laser operation, Mirrors, Imaging spectroscopy, Antennas, Laser systems engineering, Nonlinear dynamics, Resonators

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Proceedings Article | 14 April 2006 Paper

Spin-controlled vertical cavity surface-emitting lasers

Stephan Hövel, Nils Gerhardt, Carsten Brenner, Martin Hofmann, Fang-Yuh Lo, Dirk Reuter, Andreas Wieck, Ellen Schuster, Werner Keune

Proceedings Volume 6184, 61840Y (2006) https://doi.org/10.1117/12.662411

KEYWORDS: Polarization, Vertical cavity surface emitting lasers, Magnetism, Quantum wells, Electrons, Spintronics, Semiconductors, Optical pumping, Magnetic semiconductors, Spin polarization

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Proceedings Article | 28 April 2005 Paper

Spin-controlled LEDs and VCSELs

Nils Gerhardt, Stephan Hoevel, Carsten Brenner, Martin Hofmann, Junling Yang, Dirk Reuter, Andreas Wieck

Proceedings Volume 5722, (2005) https://doi.org/10.1117/12.590346

KEYWORDS: Polarization, Vertical cavity surface emitting lasers, Spin polarization, Light emitting diodes, Semiconductors, Laser damage threshold, Magnetism, Quantum wells, Spintronics, Ferromagnetics

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Showing 5 of 29 publications

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