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Extended cavity diode laser master-oscillator-power-amplifier for operation of an iodine frequency reference on a sounding rocket
/forschung/publikationen/extended-cavity-diode-laser-master-oscillator-power-amplifier-for-operation-of-an-iodine-frequency-reference-on-a-sounding-rocket
We present a hybrid microintegrated diode laser module developed for iodine spectroscopy on board a sounding rocket. The laser module is based on a master-oscillator-power-amplifier concept: an…
AlN overgrowth of nano-pillar-patterned sapphire with different offcut angle by metalorganic vapor phase epitaxy
/forschung/publikationen/aln-overgrowth-of-nano-pillar-patterned-sapphire-with-different-offcut-angle-by-metalorganic-vapor-phase-epitaxy
We present overgrowth of nano-patterned sapphire with different offcut angles by metalorganic vapor phase epitaxy. Hexagonal arrays of nano-pillars were prepared via Displacement Talbot Lithography…
Mode-locked diode laser-based two-photon polymerisation
/forschung/publikationen/mode-locked-diode-laser-based-two-photon-polymerisation
In this Letter, the authors present the construction of three-dimensional microstructures by two-photon polymerisation induced by ultrashort pulses of a mode-locked diode laser. The ultrafast light…
Versatile high power pulse-laser source for pico- and nanosecond optical pulses
/forschung/publikationen/versatile-high-power-pulse-laser-source-for-pico-and-nanosecond-optical-pulses
This paper presents a pulse-laser source for the generation of ps and ns laser pulses with more than 50 W peak output power. The final stages of the drivers use GaN transistors and are capable…
Preface - JSS Focus Issue on Recent Advances in Wide Bandgap III-Nitride Devices and Solid State Lighting: A Tribute to Isamu Akasaki
/forschung/publikationen/preface-jss-focus-issue-on-recent-advances-in-wide-bandgap-iii-nitride-devices-and-solid-state-lighting-a-tribute-to-isamu-akasaki
Preface - JSS Focus Issue on Recent Advances in Wide Bandgap III-Nitride Devices and Solid State Lighting: A Tribute to Isamu Akasaki F. Ren1, K.C. Mishra2, H. Amano3,…
Improvement in the Reliability of AlGaInP-Based Light-Emitting Diode Package Using Optimal Silicone and Leadframe Structure
/forschung/publikationen/improvement-in-the-reliability-of-algainp-based-light-emitting-diode-package-using-optimal-silicone-and-leadframe-structure-1
We investigated how the reliability of red light-emitting diode (LED) packages was affected by the types of silicones and package structures. The tensile strengths of different types of silicones…
Nanopatterned sapphire substrates in deep-UVLEDs: is there an optical benefit?
/forschung/publikationen/nanopatterned-sapphire-substrates-in-deep-uvleds-is-there-an-optical-benefit
Light emitting diodes (LEDs) in the deep ultra-violet (DUV) offer new perspectives for multiple applications ranging from 3D printing to sterilization. However, insufficient light extraction severely…
Bandwidth Improvement of MMIC Single-Pole-Double-Throw Passive HEMT Switches with Radial Stubs in Impedance-Transformation Networks
/forschung/publikationen/bandwidth-improvement-of-mmic-single-pole-double-throw-passive-hemt-switches-with-radial-stubs-in-impedance-transformation-networks
In this paper, we propose a new configuration for improving the isolation bandwidth of MMIC single-pole-double-throw (SPDT) passive high-electron-mobility transistor (HEMT) switches operating at…
Continuous-wave operation of DFB laser diodes based on GaN using 10th-order laterally coupled surface gratings
/forschung/publikationen/continuous-wave-operation-of-dfb-laser-diodes-based-on-gan-using-10th-order-laterally-coupled-surface-gratings
Single longitudinal mode continuous-wave operation of distributed-feedback (DFB) laser diodes based on GaN is demonstrated using laterally coupled 10th-order surface Bragg gratings. The gratings…
AlGaN/GaN HEMT based sensor and system for polar liquid detection
/forschung/publikationen/algangan-hemt-based-sensor-and-system-for-polar-liquid-detection
In this paper, a GaN-high electron mobility transistor (HEMT) based sensor is designed, fabricated and characterized for polar liquid sensing. The fabricated HEMT sensor chip is packaged by using low…