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Tri-carbon defects in carbon doped GaN
/forschung/publikationen/tri-carbon-defects-in-carbon-doped-gan
Carbon doped GaN crystals grown by hydride vapor phase epitaxy have been investigated using mid-infrared and near-ultraviolet absorption spectroscopy. Two local vibrational modes (LVMs) at…
Localization of current-induced degradation effects in (InAlGa)N-based UV-B LEDs
/forschung/publikationen/localization-of-current-induced-degradation-effects-in-inalgan-based-uv-b-leds
The degradation behavior of ultraviolet-B light emitting diodes (UV-B LEDs) emitting near 310 nm has been investigated and a method to localize the degradation effects is presented. Measurements…
On the optical polarization properties of semipolar (2021) and (2021) InGaN/GaN quantum wells
/forschung/publikationen/on-the-optical-polarization-properties-of-semipolar-2021-and-2021-ingangan-quantum-wells
In the framework of k·p-theory, semipolar (2021) and (2021) InGaN/GaN quantum wells (QWs) have equivalent band structures and are expected to have identical optical polarization properties.…
MOVPE Growth of Smooth and Homogeneous Al0.8Ga0.2N:Si Superlattices as UVC Laser Cladding Layers
/forschung/publikationen/movpe-growth-of-smooth-and-homogeneous-al08ga02nsi-superlattices-as-uvc-laser-cladding-layers
Smooth, uniform and conductive AlxGa1-xN layers with high aluminum mole fractions of x > 0.7 are required as cladding layers for laser diodes emitting in the deep ultraviolet spectral…
High power Y-branch MOPA-system with 9.7 nm wavelength tunability for IR up-conversion detection
/forschung/publikationen/high-power-y-branch-mopa-system-with-97-nm-wavelength-tunability-for-ir-up-conversion-detection
A compact master oscillator power amplifier (MOPA) laser system will be presented, consisting of Y-branch distributed Bragg reflector (DBR) laser and a tapered power amplifier, constructed on a…
Sparse Random SAR Trajectories for a Millimeter Wave 3D Radar Scanner
/forschung/publikationen/sparse-random-sar-trajectories-for-a-millimeter-wave-3d-radar-scanner
By use of a simplified mathematical model assuming far-field conditions and time-harmonic transmitted electromagnetic waves, the SAR trajectory (SAR = synthetic aperture radar) for a millimeter wave…
Towards 100 Gbps Wireless Networks Enabled by Millimeter Wave Traveling Wave Tubes
/forschung/publikationen/towards-100-gbps-wireless-networks-enabled-by-millimeter-wave-traveling-wave-tubes
New generation networks for 5G need a breakthrough to support the unstoppable increase of internet traffic. Millimeter waves offer multi-GHz bandwidth for multigigabit per second data rate. For the…
Ultrafast semiconductor lasers: pulse generation and stabilization
/forschung/publikationen/ultrafast-semiconductor-lasers-pulse-generation-and-stabilization
Progress in the generation and stabilization of optical pulse trains of edge-emitting passively mode-locked (PML) quantum dot (QD) and quantum well (QW) lasers and self-mode locked (SML) QD lasers is…
A Compact Optical Iodine Frequency Reference On A Sounding Rocket
/forschung/publikationen/a-compact-optical-iodine-frequency-reference-on-a-sounding-rocket
We present an absolute optical frequency reference based on molecular iodine and its application on a sounding rocket mission. The iodine frequency reference is based on modulation transfer…
GaN-integrated beam-switching high-power active array for satellite communications
/forschung/publikationen/gan-integrated-beam-switching-high-power-active-array-for-satellite-communications
This paper presents an active beam-switching circularly polarized array-fed reflector (AFR) integrated with GaN powered monolithic microwave integrated circuits (MMICs). The feed array of the…