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Vapour Phase Epitaxy for GaN Substrates
/forschung/publikationen/vapour-phase-epitaxy-for-gan-substrates
This paper reviews the current status of the production of freestanding gallium nitride (GaN) substrates for homoepitaxy of GaN devices. The limitations of the use of foreign substrates like sapphire…
High-power and highly efficient Tm3+-doped silica fiber lasers pumped with diode lasers operating at 1150 nm
/forschung/publikationen/high-power-and-highly-efficient-tm3-doped-silica-fiber-lasers-pumped-with-diode-lasers-operating-at-1150nbspnm
Tm3+-doped silica fiber laser was pumped with high-power 1150 nm diode lasers. Pump excited state absorption from the upper laser level populates higher energy levels allowing cross relaxation…
High-power and highly efficient diode-cladding-pumped Ho3+-doped silica fiber lasers
/forschung/publikationen/high-power-and-highly-efficient-diode-cladding-pumped-ho3-doped-silica-fiber-lasers
We demonstrate high-power operation from a singly Ho3+-doped silica fiber laser that is cladding pumped directly with diode lasers operating at 1150 nm. Internal slope efficiencies approaching…
Directly diode-pumped holmium fiber lasers
/forschung/publikationen/directly-diode-pumped-holmium-fiber-lasers
Sensitizer-free holmium-doped silica and fluoride mid-infrared fiber lasers are pumped using a high-power diode laser operating at 1148 nm. A maximum output power of 162 mW at…
The XML File Format as a General Solution for Measurement Data Storage and Exchange
/forschung/publikationen/the-xml-file-format-as-a-general-solution-for-measurement-data-storage-and-exchange
Based on the open-standard XML language, a file format devoted to measurement data is described. A draft of the file format scheme is established and a set of general rules are proposed for its…
Evaluation of Wafer-Level LRRM and LRM+ Calibration Techniques
/forschung/publikationen/evaluation-of-wafer-level-lrrm-and-lrm-calibration-techniques
This paper presents a comparison of two well-known two-port wafer-level calibration methods, the enhanced linereflect- reflect-match (eLRRM) and the advanced line-reflectmatch (LRM+) approach. Both…
Characterizing Intermodulation Distortion of High-Power Devices
/forschung/publikationen/characterizing-intermodulation-distortion-of-high-power-devices
Modern wireless communication systems demand for high power and broadband devices. There are different technologies emerging offering more and more power density, with single devices delivering power…
Diode-cladding-pumped singly Ho3+-doped silica fibre laser
/forschung/publikationen/diode-cladding-pumped-singly-ho3-doped-silica-fibre-laser
An unsaturated continuous-wave output power of 109 mW was produced from a diode-pumped Ho3+-doped double-clad silica fibre laser that did not require the use of a sensitiser. The laser operated…
Current Switch-off Solution to Protect RF Power Transistors During Measurements
/forschung/publikationen/current-switch-off-solution-to-protect-rf-power-transistors-during-measurements
A new security switch called "e-fuse" is presented here. It acts as a fuse in the bias feed, providing very fast switch-off times, thus protecting the device under test and the measurement…
Detection of terahertz radiation with diode lasers
/forschung/publikationen/detection-of-terahertz-radiation-with-diode-lasers
A standard commercial semiconductor is shown to be able to detect terahertz (THz) radiation at room temperature. A voltage variation across the active region of the device upon incident THz radiation…