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Assessment of the Limits to Peak Power of 1100nm Broad Area Single Emitter Diode Lasers under Short Pulse Conditions
/forschung/publikationen/assessment-of-the-limits-to-peak-power-of-1100nm-broad-area-single-emitter-diode-lasers-under-short-pulse-conditions
We present the results of a study using commercial high current short pulse sources (>200A, <500ns) to assess the performance and endurance limits of high power broad area devices.
Compact Watt-class visible light sources using direct frequency-doubled edge-emitting diode lasers
/forschung/publikationen/compact-watt-class-visible-light-sources-using-direct-frequency-doubled-edge-emitting-diode-lasers
Compact laser light sources in the visible spectral range emitting several Watts are required for display technology, sensor systems and material processing. Second harmonic generation (SHG) using…
HVPE growth of AlxGa1-xN alloy layers
/forschung/publikationen/hvpe-growth-of-alxga1-xn-alloy-layers
In this work growth of AlxGa1-xN layers (0 < x < 0.91) by hydride vapour phase epitaxy (HVPE) is presented. The growth process is performed in a modified horizontal reactor.…
Influence of GaN cap on robustness of AlGaN/GaN HEMTs
/forschung/publikationen/influence-of-gan-cap-on-robustness-of-algangan-hemts
DC-Step-Stress-Tests of GaN HEMTs have been performed on wafers with and without GaN-cap. The tests consist of a step ramping of drain-source voltage VDS by 5V every two hours at off-state. The…
Advanced thin film technology for ultrahigh resolution X-ray microscopy
/forschung/publikationen/advanced-thin-film-technology-for-ultrahigh-resolution-x-ray-microscopy
Further progress in the spatial resolution of X-ray microscopes is currently impaired by fundamental limitations in the production of X-ray diffractive lenses. Here, we demonstrate how advanced thin…
Polarization of eigenmodes in laser diode waveguides on semipolar and nonpolar GaN
/forschung/publikationen/polarization-of-eigenmodes-in-laser-diode-waveguides-on-semipolar-and-nonpolar-gan
Recent calculations of the eigenmodes in waveguides grown on semipolar GaN suggest that the optical polarization of the emitted light as well as the optical gain depends on the orientation of the…
Non-thermal atmospheric pressure HF plasma source: generation of nitric oxide and ozone for bio-medical applications
/forschung/publikationen/non-thermal-atmospheric-pressure-hf-plasma-source-generation-of-nitric-oxide-and-ozone-for-bio-medical-applications
A new miniature high-frequency (HF) plasma source intended for bio-medical applications is studied using nitrogen/oxygen mixture at atmospheric pressure. This plasma source can be used as an element…
Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers
/forschung/publikationen/improving-the-stability-of-distributed-feedback-tapered-master-oscillator-power-amplifiers-1
We report theoretical results on the wavelength stabilization in distributedfeedback master-oscillator power-amplifiers which are compact semiconductor laser devices capable of emitting a high…
Efficient second-harmonic generation using a semiconductor tapered amplifier in a coupled ring-resonator geometry
/forschung/publikationen/efficient-second-harmonic-generation-using-a-semiconductor-tapered-amplifier-in-a-coupled-ring-resonator-geometry
A new approach for efficient second-harmonic generation using diode lasers is presented. The experimental setup is based on a tapered amplifier operated in a ring resonator that is coupled to a…
23 W peak power picosecond pulses from a single-stage all-semiconductor master oscillator power amplifier
/forschung/publikationen/23nbspw-peak-power-picosecond-pulses-from-a-single-stage-all-semiconductor-master-oscillator-power-amplifier
Using a single-stage all-semiconductor master oscillator-power amplifier, we generate narrow-band laser pulses of 23 W peak power at 1063 nm wavelength. These pulses of 40 ps length…