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Assessing the Impact of Thermal Barriers on the Thermal Lens Shape in High Power Broad Area Diode Lasers
/en/research/publications/assessing-the-impact-of-thermal-barriers-on-the-thermal-lens-shape-in-high-power-broad-area-diode-lasers
Measured thermal profiles on GaAs broad area diode lasers (Popt > 10 W, λ = 910 nm) were reproduced in FEM simulation, indicating an unforeseen thermal barrier…
Studies of limitations to peak power and efficiency in diode lasers using extreme-double-asymmetric vertical designs
/en/research/publications/studies-of-limitations-to-peak-power-and-efficiency-in-diode-lasers-using-extreme-double-asymmetric-vertical-designs
High power diode lasers with novel extreme-double-asymmetric epitaxial designs with increased modal confinement in the well Γ achieve high efficiency (50%) and powers (14 W) at high continuous…
A portable shifted excitation Raman difference spectroscopy system: device and field demonstration
/en/research/publications/a-portable-shifted-excitation-raman-difference-spectroscopy-system-device-and-field-demonstration
In this paper, we present a portable shifted excitation Raman difference spectroscopy (SERDS) system applied in outdoor experiments. A dual-wavelength diode laser emitting at 785 nm is used as…
In-situ control of large area (11-22)-GaN growth on patterned r-plane sapphire
/en/research/publications/in-situ-control-of-large-area-11-22-gan-growth-on-patterned-r-plane-sapphire
This report describes in-situ measurements of multi-wavelength reflectance, wafer curvature and growth temperature during epitaxy of semi-polar (11-22)-GaN on 100 mm diameter r-plane PSS.…
MOVPE growth of laser structures for high-power applications at different ambient temperatures
/en/research/publications/movpe-growth-of-laser-structures-for-high-power-applications-at-different-ambient-temperatures
Laser structures for different operating temperatures were developed. Higher temperatures need an increase in barrier height to reduce carrier leakage. Best results for an emission wavelength of…
Near-field microscopy of waveguide architectures of InGaN/GaN diode lasers
/en/research/publications/near-field-microscopy-of-waveguide-architectures-of-ingangan-diode-lasers
Waveguide (WG) architectures of 420 nm emitting InGaN/GaN diode lasers are analyzed by photoluminescence and photocurrent spectroscopy using a nearfield scanning optical microscope that scans along…
Performance Enhancement of Flip-Chip Packaged AlGaN/GaN HEMTs by Strain Engineering Design
/en/research/publications/performance-enhancement-of-flip-chip-packaged-algangan-hemts-by-strain-engineering-design
The piezoelectric polarization of the AlGaN/GaN high-electron-mobility transistors (HEMTs) is strongly related to the strain state in the active area. Therefore, understanding the strain behavior…
Effect of barrier recess on transport and electrostatic interface properties of GaN-based normally-off and normally-on metal oxide semiconductor heterostructure field effect transistors
/en/research/publications/effect-of-barrier-recess-on-transport-and-electrostatic-interface-properties-of-gan-based-normally-off-and-normally-on-metal-oxide-semiconductor-heterostructure-field-effect-transistors
We perform a comprehensive electrical transport and physical characterization of metal oxide semiconductor heterostructure field effect transistors with ZrO2 gate dielectrics, having partially…
Electronic properties of Si-doped AlxGa1-xN with aluminum mole above 80%
/en/research/publications/electronic-properties-of-si-doped-alxga1-xn-with-aluminum-mole-above-80
The dependence of the activation energy as well as the energetic levels of the neutral charge state the DX center of the Si donor in AlxGa1-xN:Si samples on aluminum content and SiH4/III ratio…
Miniaturised master-oscillator poweramplifier emitting a single longitudinal mode with more than 300 mW at 647 nm
/en/research/publications/miniaturised-master-oscillator-poweramplifier-emitting-a-single-longitudinal-mode-with-more-than-300-mw-at-647-nm
A miniaturised red-emitting master-oscillator power-amplifier (MOPA) was developed. The MOPA emits a single longitudinal mode with a linewidth below 10 MHz and an optical output power of more…