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24 November 2023 Spectral characteristics optimization of high power semiconductor laser diodes by adjusting the reflectivity of the cavity surface coating film
Kang Zhang, Fengxin Dong, Xuyan Zhou, Jianxin Zhang, Hailing Wang, Lichang Wang, Xueshuang Wang, Yankun Wang, Yanqing Jia, Ting Fu, Hongwei Qu
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Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129354J (2023) https://doi.org/10.1117/12.3008036
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China
Abstract
The beam quality of the semiconductor laser is influenced by the structure of the laser's own waveguide as well as the beam shaping system. The cylindrical lens is used to compress the laser beam in the fast-axis direction in optically pumped source applications. Significant spectral deterioration occurs during the shaping of the laser beam. The spectrum of the laser split into some small peaks and misaligned with the absorption peaks of the crystal, resulting in a decrease in the overall absorption efficiency. In this paper, the reasons of spectral deterioration are investigated, and the spectral characteristics are optimized by varying the the output facet coating film’s reflectivity of the semiconductor laser chip. An improvement scheme for spectral deterioration of high power semiconductor lasers after beam shaping is proposed. The experiment results shows that the deterioration of the spectrum is significantly eliminated when the coating film’s reflectivity is adjusted from 0.88% to nearly 15%. A 976nm high power semiconductor laser chip with 7.16% reflectivity coating film has the highest slope efficiency. Due to a trade-off between spectral quality and the slope efficiency, it is necessary to choose an appropriate coating film’s reflectivity on the output facet surface to achieve both high output power and good spectra. This has important application prospects in future solid-state laser pump source applications.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Kang Zhang, Fengxin Dong, Xuyan Zhou, Jianxin Zhang, Hailing Wang, Lichang Wang, Xueshuang Wang, Yankun Wang, Yanqing Jia, Ting Fu, and Hongwei Qu "Spectral characteristics optimization of high power semiconductor laser diodes by adjusting the reflectivity of the cavity surface coating film", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129354J (24 November 2023); https://doi.org/10.1117/12.3008036
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KEYWORDS
Coating
Semiconductor lasers
Collimation
High power lasers
Mirrors
Reflection
Diodes
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