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Improved efficiency and beam divergence in kW-class diode laser bars with edge-heaters
/forschung/publikationen/improved-efficiency-and-beam-divergence-in-kw-class-diode-laser-bars-with-edge-heaters
We present a novel approach to flattening the in-chip thermal profile that develops within multiple-emitter, 1-cm-wide bars by optimally manipulating heating at the edge-emitters. The best-designed…
Bragg Gratings Reflectance Prediction with Coupled Mode Theory Fitted to 2D FDTD
/forschung/publikationen/bragg-gratings-reflectance-prediction-with-coupled-mode-theory-fitted-to-2d-fdtd
This study explores a surrogate model using coupled mode theory to predict the reflectivity spectrum of surface Bragg gratings. We use 2D FDTD simulations to build and validate the surrogate model.…
Individual nanostructures in an epsilon-near-zero material probed with 3D-sculpted light
/forschung/publikationen/individual-nanostructures-in-an-epsilon-near-zero-material-probed-with-3d-sculpted-light
Epsilon-near-zero (ENZ) materials, i.e., materials with a vanishing real part of the permittivity, have become an increasingly desirable platform for exploring linear and nonlinear optical phenomena…
Flat dispersion at large momentum transfer at the onset of exciton polariton formation
/forschung/publikationen/flat-dispersion-at-large-momentum-transfer-at-the-onset-of-exciton-polariton-formation
Excitons are quasiparticles, comprised of an electron excited from the valence band and attracted to the hole left behind, that govern transport properties in transition metal dichalcogenides.…
Simulation of microwave circuits and laser structures including PML by means of FIT
/forschung/publikationen/simulation-of-microwave-circuits-and-laser-structures-including-pml-by-means-of-fit
Field-oriented methods which describe the physical properties of microwave circuits and optical structures are an indispensable tool to avoid costly and time-consuming redesign cycles. Commonly the…
Comparison of surface and bulk contributions to non-radiative currents in InGaAs/AlGaAs laser diodes
/forschung/publikationen/comparison-of-surface-and-bulk-contributions-to-non-radiative-currents-in-ingaasalgaas-laser-diodes
We present novel investigations of surface and bulk contributions to the non-radiative recombination in InGaAs/AlGaAs (λ=0.98µm) RW laser diodes. These enable us to explain earlier…
120 GHz Broadband Chip-Interconnects for High Bit-Rate Communication Systems
/forschung/publikationen/120-ghz-broadband-chip-interconnects-for-high-bit-rate-communication-systems
A broad-band transition from a coaxial line to a CPW chip is simulated and realized. It is part of a 80 Gbps optoelectronic communication system covering the frequency range up to 120 GHz.…
Publikationen
/forschung/publikationen/atomic-processes-at-the-laser-front-facet-during-laser-operation
Publikationen
/forschung/publikationen/relaxation-behaviour-of-highly-strained-gaasinxga1-xasgaas-quantum-wells-depending-on-movpe-growth-conditions