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Shifted Excitation Raman Difference Spectroscopy - a potential tool for outdoor measurements in precision agriculture
/forschung/publikationen/shifted-excitation-raman-difference-spectroscopy-a-potential-tool-for-outdoor-measurements-in-precision-agriculture
In this work we present Shifted Excitation Raman Difference Spectroscopy (SERDS) as a potential spectroscopic tool for outdoor measurements in precision agriculture. A dual-wavelength diode laser at…
25-W Monolithic Spectrally Stabilized 975-nm Minibars for Dense Spectral Beam Combining
/forschung/publikationen/25-w-monolithic-spectrally-stabilized-975-nm-minibars-for-dense-spectral-beam-combining
Low-fill-factor laser bars composed of five narrow-stripe broad-area lasers (30 µm × 6000 µm) with monolithic spectral stabilization are presented. Each laser on the bar emits at…
Joule-Class 940-nm Diode Laser Bars for Millisecond Pulse Applications
/forschung/publikationen/joule-class-940-nm-diode-laser-bars-for-millisecond-pulse-applications-1
The use of long resonators (for improved thermal and electrical resistance) and advanced facet passivation (for high power) is shown to enable Joule-class pulse emission from single passively cooled…
Thermal characterization of AlGaN/GaN HEMTs on Si and n-SiC substrates
/forschung/publikationen/thermal-characterization-of-algangan-hemts-on-si-and-n-sic-substrates
The thermal properties of large periphery 60 mΩ AlGaN/GaN HEMTs fabricated on Si and SiC substrates have been studied by applying pulsed Ids characterization at varying base plate temperatures and by…
Current Dispersion in Short Channel AlGaN/GaN HEMTs
/forschung/publikationen/current-dispersion-in-short-channel-algangan-hemts
This work presents investigations of the dynamic behavior of short channel AlGaN/GaN HEMTs with Lg varying from 100 nm to 200 nm. Transistors were fabricated using AlGaN/GaN epitaxial structures with…
High-Power Distributed Feedback Lasers With Surface Gratings: Theory and Experiment
/forschung/publikationen/high-power-distributed-feedback-lasers-with-surface-gratings-theory-and-experiment
Semiconductor lasers with integrated surface gratings are known to operate with narrow spectra as well as high power and efficiency. In this paper, we present a theoretical description of DFB lasers…
Improved thermal management of InP transistors in transferred-substrate technology with diamond heat-spreading layer
/forschung/publikationen/improved-thermal-management-of-inp-transistors-in-transferred-substrate-technology-with-diamond-heat-spreading-layer
A method to improve the thermal management of indium phosphide (InP) double-hetero bipolar transistors (DHBTs) fabricated in a transferred- substrate technology is presented. A vapour-phase deposited…
Semi-polar (1122) -GaN templates grown on 100 mm trench-patterned r-plane sapphire
/forschung/publikationen/semipolar-1122-ingan-light-emitting-diodes-grown-on-chemically-mechanically-polished-gan-templates
InGaN multiple quantum well light-emitting diodes (LEDs) were grown on chemically-mechanically polished (1122) GaN templates (up to 100mm diameter wafers) by metalorganic vapour phase epitaxy.…
24-wavelength distributed Bragg reflector laser array with surface gratings
/forschung/publikationen/24-wavelength-distributed-bragg-reflector-laser-array-with-surface-gratings
A small footprint diode laser array of 24 individually addressable distributed Bragg reflector lasers is presented. Third-order gratings etched into the surface of an AlGaAs vertical waveguide…
High Beam Quality in Broad Area Lasers via Suppression of Lateral Carrier Accumulation
/forschung/publikationen/high-beam-quality-in-broad-area-lasers-via-suppression-of-lateral-carrier-accumulation
High power 9xx-nm broad-area lasers with improved beam quality are required for many applications, but the physical limitations remain unclear, especially the relative importance of free-carrier and…