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Optical Feedback Generated by Tapered Amplifiers Emitting at 1120 nm
/forschung/publikationen/optical-feedback-generated-by-tapered-amplifiers-emitting-at-1120-nm
In this work the optical feedback generated by a tapered amplifier (TPA) emitting at 1120 nm is characterized at different operational conditions. The TPA is operated in a master oscillator…
Detection of calcium phosphate species in soil by confocal µ-Raman spectroscopy
/forschung/publikationen/detection-of-calcium-phosphate-species-in-soil-by-confocal-micro-raman-spectroscopy
Background: Raman spectroscopy is a promising but largely underexplored tool for the detection of phosphates (P) in soil. Although it requires minimal sample preparation, it has been demonstrated…
Au-Free Ohmic Contact for GaN High-Electron-Mobility Transistors
/forschung/publikationen/au-free-ohmic-contact-for-gan-high-electron-mobility-transistors-1
Herein, the fabrication of Au-free ohmic contacts for mm-wave GaN heterojunction field-effect transistors is investigated. To find an optimum metal stack and annealing recipe, different metallization…
Logarithmic trapping and detrapping in β-Ga2O3 MOSFETs: Experimental analysis and modeling
/forschung/publikationen/logarithmic-trapping-and-detrapping-in-beta-ga2o3-mosfets-experimental-analysis-and-modeling
In this paper, we extensively characterize and model the threshold voltage instability in lateral β-Ga2O3 MOSFETs with Al2O3 gate dielectric. Specifically, (i) the results indicate that the…
Passively Q-switched microchip laser based picosecond light source in the visible-red to near-infrared band for semiconductor excitation
/forschung/publikationen/passively-q-switched-microchip-laser-based-picosecond-light-source-in-the-visible-red-to-near-infrared-band-for-semiconductor-excitation
We developed a visible-red to near-infrared wavelength tunable all-solid-state laser system utilizing an optical parametric generation process in a MgO doped PPLN crystal pumped at 532 nm by an…
Coordination and organometallic precursors of group 10 and 11: Focused electron beam induced deposition of metals and insight gained from chemical vapour deposition, atomic layer deposition, and fundamental surface and gas phase studies
/forschung/publikationen/coordination-and-organometallic-precursors-of-group-10-and-11-focused-electron-beam-induced-deposition-of-metals-and-insight-gained-from-chemical-vapour-deposition-atomic-layer-deposition-and-fundamental-surface-and-gas-phase-studies
Nanostructured materials made from group 10 (Ni, Pd, Pt) and group 11 (Cu, Ag, Au) elements have outstanding technological relevance in microelectronics, nano-optics, catalysis, and energy…
Spectrally pure far-UVC emission from AlGaN-based LEDs with dielectric band pass filters
/forschung/publikationen/spectrally-pure-far-uvc-emission-from-algan-based-leds-with-dielectric-band-pass-filters
AlGaN-based far ultraviolet-C (UVC) light emitting diodes (LEDs) with a peak emission wavelength below 240 nm typically show a long-wavelength tail at >240 nm that is detrimental to the use…
Continuous-wave operation of 405 nm distributed Bragg reflector laser diodes based on GaN using 10th-order surface gratings
/forschung/publikationen/continuous-wave-operation-of-405-nm-distributed-bragg-reflector-laser-diodes-based-on-gan-using-10th-order-surface-gratings
Single longitudinal mode continuous-wave operation of GaN-based distributed Bragg reflector (DBR) laser diodes with 10th-order surface gratings is demonstrated. The DBR consists of periodic V-shaped…
60% Efficient Monolithically Wavelength-Stabilized 970-nm DBR Broad-Area Lasers
/forschung/publikationen/60-efficient-monolithically-wavelength-stabilized-970-nm-dbr-broad-area-lasers
Progress in epitaxial design is shown to enable increased optical output power Popt and power conversion efficiency ηE and decreased lateral far-field divergence angle in GaAs-based distributed…
Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality
/forschung/publikationen/optimizing-vertical-and-lateral-waveguides-of-kw-class-laser-bars-for-higher-peak-power-efficiency-and-lateral-beam-quality
GaAs-based, highly-efficient, kW-class, 1-cm laser bars with high peak power Popt and improved beam quality in quasi-continuous-wave mode are presented. The use of an extreme-triple-asymmetric (ETAS)…