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Low-loss, smile-insensitive external frequency-stabilization of high power diode lasers enabled by vertical designs with extremely low divergence angle and high efficiency
/forschung/publikationen/low-loss-smile-insensitive-external-frequency-stabilization-of-high-power-diode-lasers-enabled-by-vertical-designs-with-extremely-low-divergence-angle-and-high-efficiency
Broad area lasers with narrow spectra are required for many pumping applications and for wavelength beam combination. Although monolithically stabilized lasers show high performance, some…
Suppression of Mode Switching Noise in Wavelength Stabilized Laser Diodes by External Bragg Gratings
/forschung/publikationen/suppression-of-mode-switching-noise-in-wavelength-stabilized-laser-diodes-by-external-bragg-gratings
Special applications require low noise wavelength stabilized diode lasers for pumping of solid state lasers. We report on intensity noise in the frequency range of kHz to MHz due to bi-stable mode…
High power, high beam quality laser source with narrow, stable spectra based on truncated-tapered semiconductor amplifier
/forschung/publikationen/high-power-high-beam-quality-laser-source-with-narrow-stable-spectra-based-on-truncated-tapered-semiconductor-amplifier
High power diode lasers are increasingly important in many industrial applications. However, an ongoing challenge is to simultaneously obtain high output power, diffraction-limited beam quality and…
Efficient concept generating 3.9 W of diffraction-limited green light with spectrally combined tapered diode lasers
/forschung/publikationen/efficient-concept-generating-39-w-of-diffraction-limited-green-light-with-spectrally-combined-tapered-diode-lasers
We propose an efficient concept increasing the power of diode laser systems in the visible spectral range. In comparison with second harmonic generation of single emitters, we show that spectral beam…
Effect of index-antiguiding on the threshold of GaN-based narrow ridge-waveguide laser diodes
/forschung/publikationen/effect-of-index-antiguiding-on-the-threshold-of-gan-based-narrow-ridge-waveguide-laser-diodes
The effect of index antiguiding on GaN-based blue and violet laser diodes has been investigated. Strong antiguiding effects are proposed to be responsible for the large dependence of the threshold…
Cryolaser: innovative cryogenic diode laser bars optimized for emerging ultra-high power laser applications
/forschung/publikationen/cryolaser-innovative-cryogenic-diode-laser-bars-optimized-for-emerging-ultra-high-power-laser-applications
"Cryolaser" diode laser designs exploit the improvement in semiconductor material properties at sub-zero temperatures to increase efficiency and power. Optimized single 9xx-nm laser bars…
AlGaN Metal-Semiconductor-Metal Photodetectors on Planar and Epitaxial Laterally Overgrown AlN/Sapphire Templates for the Ultraviolet C Spectral Region
/forschung/publikationen/algan-metal-semiconductor-metal-photodetectors-on-planar-and-epitaxial-laterally-overgrown-alnsapphire-templates-for-the-ultraviolet-c-spectral-region
Schottky type metal-semiconductor-metal (MSM) Al0.4Ga0.6N photodetectors (PDs) for the ultraviolet C spectral region on conventional planar AlN templates are compared with epitaxial laterally…
Generation of sub-100 ps pulses with a peak power of 65 W by gain switching, pulse shortening and pulse amplification using a semiconductor based MOPA system
/forschung/publikationen/generation-of-sub-100-ps-pulses-with-a-peak-power-of-65-w-by-gain-switching-pulse-shortening-and-pulse-amplification-using-a-semiconductor-based-mopa-system
We present a method of the generation of sub-100 ps pulses with an all-semiconductor master oscillator-power amplifier (MOPA) system, consisting of a three section distributed Bragg reflector…
A Dual-Band Voltage-Mode Class-D PA for 0.8/1.8 GHz Applications
/forschung/publikationen/a-dual-band-voltage-mode-class-d-pa-for-0818-ghz-applications
This paper presents a compact dual-band voltage-mode class-D power amplifier module suitable for the LTE frequency bands at 0.8 GHz and 1.8 GHz. It uses a broadband GaN voltage-mode PA MMIC…
Plasmaquellen für biomedizinische Applikationen
/forschung/publikationen/plasmaquellen-fuer-biomedizinische-applikationen
Mit dem Einsatz physikalischer Plasmen eröffnen sich neue wissenschaftliche Fragestellungen und therapeutische Ansätze in der Medizin. Grundlegende, interdisziplinäre Forschung hat das Ziel, die…