Stefan Hengesbach

TL;DR: In this article, a new generation of vertical emitting diode laser (VCSELs) made significant progress and provided easy scalable output power in the kW range, which can be used for direct materials processing substituting other laser types like CO2 lasers and lamp pumped solid state lasers.

TL;DR: The simulation of spectral stabilization of broad-area edge-emitting semiconductor diode lasers is presented and the focus of the model lies on the prediction of influences on the spectrum and power characteristics by frequency selective feedback from external optical resonators.

TL;DR: In this paper, the authors showed that VHG-stabilized ELOD-based diode lasers have significantly lower loss and larger operation windows than conventional diode laser designs in the collimated feedback regimes, even in the presence of significant (≥ 1 μm) bar smile.

TL;DR: A dense wavelength division multiplexer based on volume Bragg gratings (VBGs) with a channel spacing of Δλ = 1.5 nm is presented, which constrict the spectral bandwidth of passively cooled multimode diode laser bars with 19 broad-area emitters to δλ95% = 120 pm.

TL;DR: In this article, the authors compared the influence of diode laser design on stabilization performance by comparing devices with super large optical waveguides (4.8 μm) and narrow vertical far fields with reference designs with thinner waveguiders (1.6 μm).