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Mid-infrared beam splitter for ultrashort pulses
/en/research/publications/mid-infrared-beam-splitter-for-ultrashort-pulses
A design is presented for a beam splitter suitable for ultrashort pulses in the mid-infrared and terahertz spectral range consisting of a structured metal layer on a diamond substrate. Both the…
Impact of longitudinal refractive index change on the near-field width of high-power broad-area diode lasers
/en/research/publications/impact-of-longitudinal-refractive-index-change-on-the-near-field-width-of-high-power-broad-area-diode-lasers
Typical for broad-area laser (BAL) diodes operating in a continuous-wave mode is a narrowing of the near-field (NF) width at the output facet for high injection currents (output powers). This…
Comparison of symmetric and asymmetric double quantum well extended-cavity diode lasers for broadband passive mode-locking at 780 nm
/en/research/publications/comparison-of-symmetric-and-asymmetric-double-quantum-well-extended-cavity-diode-lasers-for-broadband-passive-mode-locking-at-780nbspnm
We present a compact, mode-locked diode laser system designed to emit a frequency comb in the wavelength range around 780 nm. We compare the mode-locking performance of symmetric and asymmetric…
Iridium Plug Technology for AlGaN/GaN HEMT Short-Gate Fabrication
/en/research/publications/iridium-plug-technology-for-algangan-hemt-short-gate-fabrication
The purpose of this work is to introduce a novel concept for the AlGaN/GaN HEMT embedded gate fabrication. The novelty of the proposed gate fabrication method is to obtain a stress relief volume…
DFB lasers with apodized surface gratings for wavelength stabilization and high efficiency
/en/research/publications/dfb-lasers-with-apodized-surface-gratings-for-wavelength-stabilization-and-high-efficiency
We present results of GaAs-based distributed-feedback (DFB) broad-area (BA) lasers with integrated surface-etched gratings. Lasers with longitudinally varying (apodized) Bragg gratings are compared…
Direct Modulation Capabilities of Micro-Integrated Laser Sources in the Yellow-Green Spectral Range
/en/research/publications/direct-modulation-capabilities-of-micro-integrated-laser-sources-in-the-yellow-green-spectral-range
In this letter, the millisecond modulation capabilities of high power multisection diode laser systems and their application to second harmonic generation (SHG) are investigated. Different modulation…
JOKARUS - design of a compact optical iodine frequency reference for a sounding rocket mission
/en/research/publications/jokarus-design-of-a-compact-optical-iodine-frequency-reference-for-a-sounding-rocket-mission
We present the design of a compact absolute optical frequency reference for space applications based on hyperfine transitions in molecular iodine with a targeted fractional frequency instability of…
100-MHz GaN-HEMT Class-G Supply Modulator for High-Power Envelope-Tracking Applications
/en/research/publications/100-mhz-gan-hemt-class-g-supply-modulator-for-high-power-envelope-tracking-applications
In this paper, a highly efficient class-G supply modulator targeting high-power wideband envelope tracking applications is presented. The maximum output power using a 50% duty cycle at 100-MHz…
Realisation of a widely tuneable sampled grating DBR laser emitting around 970 nm
/en/research/publications/realisation-of-a-widely-tuneable-sampled-grating-dbr-laser-emitting-around-970-nm
Design and fabrication of a monolithic, single aperture widely tuneable diode laser emitting around 970 nm is presented. Overgrown sampled grating Bragg reflectors are applied to setup…
Design considerations for AlGaN-based UV LEDs emitting near 235 nm with uniform emission pattern
/en/research/publications/design-considerations-for-algan-based-uv-leds-emitting-near-235nbspnm-with-uniform-emission-pattern
The uniformity of emission from deep ultraviolet light emitting diodes (UV LEDs) is investigated. The AlGaN-based heterostructures of the UV LEDs emitting around 235 nm were grown by…