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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…
Waveguide Optimization for Semipolar (In,Al,Ga)N Lasers
/forschung/publikationen/waveguide-optimization-for-semipolar-inalgan-lasers
In this work the optical waveguiding in semipolar InGaN-based laser diodes is analyzed. Different designs of the separate confinement heterostructure with AlGaN or GaN cladding layers and GaN or…
Quantum Efficiency Analysis of Near-Ultraviolet Emitting AlGaN and AlInGaN Structures
/forschung/publikationen/quantum-efficiency-analysis-of-near-ultraviolet-emitting-algan-and-alingan-structures
The quantum efficiency of c-plane AlxGa1-xN and AlxInyGa1-x-yN structures (x = 0.06-0.21, y = 0.015-0.05) emitting in the UV spectral range between 320 and 350nm was analyzed…
GaN-HEMTs devices with Single- and Double-heterostructure for power switching applications
/forschung/publikationen/gan-hemts-devices-with-single-and-double-heterostructure-for-power-switching-applications
We report on an extensive study of single- (SH) and double-heterostructure (DH) HEMTs based on gallium nitride, for power switching applications. The analysis is based on dc, pulsed and breakdown…
Miniaturized diode laser based light sources for in-situ shifted excitation Raman difference spectroscopy
/forschung/publikationen/miniaturized-diode-laser-based-light-sources-for-in-situ-shifted-excitation-raman-difference-spectroscopy
Weak Raman bands are often covered by pronounced background signals due to fluorescence or Rayleigh scattering. Several techniques to separate Raman lines from the background are known. In this…
Monolithic Y-branch dual-wavelength DBR diode laser at 671 nm for Shifted Excitation Raman Difference Spectroscopy
/forschung/publikationen/monolithic-y-branch-dual-wavelength-dbr-diode-laser-at-671-nm-for-shifted-excitation-raman-difference-spectroscopy
A dual-wavelength laser diode source suitable for shifted excitation Raman difference spectroscopy (SERDS) is presented. This monolithic device contains two ridge waveguide (RW) sections with…