K
K.-H. Hasler
Researcher at Ferdinand-Braun-Institut
Publications - 22
Citations - 687
K.-H. Hasler is an academic researcher from Ferdinand-Braun-Institut. The author has contributed to research in topics: Laser & Semiconductor laser theory. The author has an hindex of 9, co-authored 22 publications receiving 609 citations. Previous affiliations of K.-H. Hasler include Leibniz Association.
Papers
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Journal ArticleDOI
Efficient High-Power Laser Diodes
Paul Crump,G. Erbert,H. Wenzel,C. Frevert,C. M. Schultz,K.-H. Hasler,R. Staske,Bernd Sumpf,A. Maassdorf,F. Bugge,S. Knigge,G. Trankle +11 more
TL;DR: In this paper, a review of efforts to increase ηE is presented and it is shown that for well-optimized structures, the residual losses are dominated by the p-side waveguide and nonideal internal quantum efficiency.
Journal ArticleDOI
High-Brightness Quantum Well Tapered Lasers
Bernd Sumpf,K.-H. Hasler,Pawel Adamiec,Frank Bugge,F. Dittmar,J. Fricke,H. Wenzel,Martin Zorn,G. Erbert,Günther Tränkle +9 more
TL;DR: In this paper, a high-power quantum well laser with high brightness in the spectral range between 650 nm and 1080 nm was presented, with a narrow vertical far-field divergence down to angles of 15 degrees.
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Fundamental-Lateral Mode Stabilized High-Power Ridge-Waveguide Lasers With a Low Beam Divergence
TL;DR: In this paper, the authors compare ridge-waveguide laser with trench widths of 5 and 20 mum, and show that the 5mum trench-width device exhibits a much more stable lateral far-field.
Journal ArticleDOI
Comparative theoretical and experimental studies of two designs of high-power diode lasers
TL;DR: In this article, an extreme double asymmetric design to mitigate the impact of the p-side waveguide is studied and compared with a more conventional design, and an increase of the efficiency at the highest power is demonstrated, but it is less than expected from simulations.
Journal ArticleDOI
5-W DBR Tapered Lasers Emitting at 1060 nm With a Narrow Spectral Linewidth and a Nearly Diffraction-Limited Beam Quality
K.-H. Hasler,Bernd Sumpf,P. Adamiec,F. Bugge,J. Fricke,Peter Ressel,Hans Wenzel,G. Erbert,G. Trankle +8 more
TL;DR: In this paper, a distributed Bragg reflector tapered laser with a wavelength of about 1060 nm was realized, achieving 5-W output power with a narrow spectral linewidth below 40 pm (95% power) and a nearly diffraction-limited beam quality.