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Preparation and atomic structure of reconstructed (0001) InGaN surfaces
/forschung/publikationen/preparation-and-atomic-structure-of-reconstructed-0001-ingan-surfaces
The preparation and surface structure of high quality group-III-polar (0001) InGaN layers grown by metal-organic vapor phase epitaxy have been investigated. In order to obtain a clean and…
Emulation of the operation and degradation of high-power laser bars using simulation tools
/forschung/publikationen/emulation-of-the-operation-and-degradation-of-high-power-laser-bars-using-simulation-tools
We report on the simulation of high-power laser bars and the emulation of their ageing behaviour, using simulation tools originally developed for single emitter laser diodes. Simulations of a…
Modular Assembly of Diode Lasers in a Compact and Reliable Setup for a Wide Range of Applications
/forschung/publikationen/modular-assembly-of-diode-lasers-in-a-compact-and-reliable-setup-for-a-wide-range-of-applications
In the development process towards an integration of laser systems into compact modules many key points can be simulated. Yet, a reliable and stable testing environment is needed for a deeper…
Continuous wave terahertz radiation from an InAs/GaAs quantum-dot photomixer device
/forschung/publikationen/continuous-wave-terahertz-radiation-from-an-inasgaas-quantum-dot-photomixer-device
Generation of continuous wave radiation at terahertz (THz) frequencies from a heterodyne source based on quantum-dot (QD) semiconductor materials is reported. The source comprises an active region…
Modulated Epitaxial Lateral Overgrowth of AlN for Efficient UV LEDs
/forschung/publikationen/modulated-epitaxial-lateral-overgrowth-of-aln-for-efficient-uv-leds
A reduction of the threading dislocation density in AlN layers on a sapphire from 1010 cm-2 to 109 cm-2 was achieved by applying epitaxial lateral overgrowth (ELO) of patterned AlN and…
Four-wave interference and perfect blaze
/forschung/publikationen/four-wave-interference-and-perfect-blaze
The recently calculated high diffraction efficiencies for TE- and TM-polarized light (perfect blaze) for echelette gratings are explained by four-wave interference, which is formed as a double…
High-spectral-radiance, red-emitting tapered diode lasers with monolithically integrated distributed Bragg reflector surface gratings
/forschung/publikationen/high-spectral-radiance-red-emitting-tapered-diode-lasers-with-monolithically-integrated-distributed-bragg-reflector-surface-gratings
A red-emitting tapered diode laser with a monolithically integrated distributed Bragg reflector grating is presented. The device is able to emit up to 1 W of spectrally stabilized optical output…
Diode laser frequency doubling in a ppMgO:LN ridge waveguide: influence of structural imperfection, optical absorption and heat generation
/forschung/publikationen/diode-laser-frequency-doubling-in-a-ppmgoln-ridge-waveguide-influence-of-structural-imperfection-optical-absorption-and-heat-generation
In this work, we investigate experimentally and theoretically limitations of highly efficient high-power single-pass second-harmonic generation process in a quasiphase matched magnesium oxide-doped…
Graphene mode-locked femtosecond Yb:KLuW laser
/forschung/publikationen/graphene-mode-locked-femtosecond-ybkluw-laser
Large-area monolayer graphene, synthesized by chemical vapor deposition, was transferred to a 1-in. quartz substrate. The high-quality monolayer graphene has been subject to characterization of the…
Efficient concept for generation of diffraction-limited green light by sum-frequency generation of spectrally combined tapered diode lasers
/forschung/publikationen/efficient-concept-for-generation-of-diffraction-limited-green-light-by-sum-frequency-generation-of-spectrally-combined-tapered-diode-lasers
In order to increase the power of visible diode laser systems in an efficient manner, we propose spectral beam combining with subsequent sum-frequency generation. We show that this approach, in…