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Silicon induced defect reduction in AlN template layers for epitaxial lateral overgrowth
/forschung/publikationen/silicon-induced-defect-reduction-in-aln-template-layers-for-epitaxial-lateral-overgrowth
The effect of Si doping on defect density in AlN layers grown on sapphire was analysed. Si concentration in the range of 1019cm-3 leads to dislocation line inclination in AlN layers with a threading…
Gas Sensing of Nitrogen Oxide Utilizing Spectrally Pure Deep UV LEDs
/forschung/publikationen/gas-sensing-of-nitrogen-oxide-utilizing-spectrally-pure-deep-uv-leds
In this paper, we will present the development of a compact LED-based optical gas sensing system in the ultraviolet-C spectral region. This includes the design of the LED heterostruc- ture emitting…
The Digital Power Amplifier for the Wireless Infrastructure: Status and Prospects
/forschung/publikationen/the-digital-power-amplifier-for-the-wireless-infrastructure-status-and-prospects
In digital power amplifiers the analog signal is not handled directly but encoded in a pulse train. It is restored only at the output by a bandpass filter. Due to the discretization in amplitude,…
Method for in-depth characterization of electro-optic phase modulators
/forschung/publikationen/method-for-in-depth-characterization-of-electro-optic-phase-modulators
A flexible method to measure the modulation efficiency and residual amplitude modulation, including nonlinearities, of phase modulators is presented. The method is based on demodulation of the…
Autonomous frequency stabilization of two extended-cavity diode lasers at the potassium wavelength on a sounding rocket
/forschung/publikationen/autonomous-frequency-stabilization-of-two-extended-cavity-diode-lasers-at-the-potassium-wavelength-on-a-sounding-rocket
We have developed, assembled, and flight-proven a stable, compact, and autonomous extended-cavity diode laser (ECDL) system designed for atomic physics experiments in space. To that end, two…
On Distortion in Digital Microwave Power Amplifiers
/forschung/publikationen/on-distortion-in-digital-microwave-power-amplifiers
In this paper, a first study of distortion in digital power amplifiers (PA) is presented. The work is based on a voltage mode class-S PA with a GaN MMIC for the 900 MHz frequency band. The…
Tight Focus Toward the Future: Tight Material Combination for Millimeter-Wave RF Power Applications: InP HBT SiGe BiCMOS Heterogeneous Wafer-Level Integration
/forschung/publikationen/tight-focus-toward-the-future-tight-material-combination-for-millimeter-wave-rf-power-applications-inp-hbt-sige-bicmos-heterogeneous-wafer-level-integration
The push to conquer the sparsely used electromagnetic spectrum between 100 and 1,000 GHz, commonly known as the millimeter-wave (mmW) and sub-mmW regions, is now in full force. The current rapid…
Efficient generation of 3.5 W laser light at 515 nm by frequency doubling a single-frequency high power DBR tapered diode laser
/forschung/publikationen/efficient-generation-of-35-w-laser-light-at-515-nm-by-frequency-doubling-a-single-frequency-high-power-dbr-tapered-diode-laser
More than 3.5 W of green light at 515 nm is generated by frequency doubling a single-frequency high power DBR tapered diode laser. The frequency doubling is performed in a cascade of PPMgLN…
The effects of magnesium doping on the modal loss in AlGaN-based deep UV lasers
/forschung/publikationen/the-effects-of-magnesium-doping-on-the-modal-loss-in-algan-based-deep-uv-lasers
Absorption losses in the Mg-doped layers significantly contribute to the modal losses in group-III-nitride-based lasers. In this paper, we investigate the influence of Mg-doping on the modal…
Analysis of doping concentration and composition in wide bandgap AlGaN:Si by wavelength dispersive x-ray spectroscopy
/forschung/publikationen/analysis-of-doping-concentration-and-composition-in-wide-bandgap-algansi-by-wavelength-dispersive-x-ray-spectroscopy
Detailed knowledge of the dopant concentration and composition of wide band gap AlxGa1-xN layers is of crucial importance for the fabrication of ultra violet light emitting diodes. This paper…