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4 December 2024 Investigation of polarization-direction-dependent SBS threshold in monolithic high-power PM fiber amplifiers
Yu Wen, Qiuhui Chu, Rumao Tao, Haokun Li, Chun Zhang, Lingli Huang, Yuan Zhu, Yuefang Yan, Qiang Shu, Haoyu Zhang, Jianjun Wang
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Proceedings Volume 13283, Conference on Spectral Technology and Applications (CSTA 2024); 1328311 (2024) https://doi.org/10.1117/12.3034507
Event: Conference on Spectral Technology and Applications (CSTA 2024), 2024, Dalian, China
Abstract
In this work, we report experimental investigations of polarization-direction-dependent SBS threshold in monolithic high power PM amplifier. The polarization direction in the monolithic amplifier was changed by rotating the output fiber port of the seed laser before splicing to the input fiber of the amplifiers. By increasing the relative rotating angle from 0° to 90°, the polarization-direction of the input laser changed synchronously, and the measured SBS threshold increased monotonically until reaching a maximum value, beyond which it decreased in a nearly symmetrical trend. The polarization extinction ratio of output laser behaved in an opposite trend. The highest SBS threshold was reached with the polarization angle being 45°, delivered a threshold enhancement of 67% compared with that at 0°. The results provided a reference for the improvement of SBS threshold in monolithic high power PM fiber amplifiers.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Yu Wen, Qiuhui Chu, Rumao Tao, Haokun Li, Chun Zhang, Lingli Huang, Yuan Zhu, Yuefang Yan, Qiang Shu, Haoyu Zhang, and Jianjun Wang "Investigation of polarization-direction-dependent SBS threshold in monolithic high-power PM fiber amplifiers", Proc. SPIE 13283, Conference on Spectral Technology and Applications (CSTA 2024), 1328311 (4 December 2024); https://doi.org/10.1117/12.3034507
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KEYWORDS
Polarization
Fiber lasers
Fiber amplifiers
Laser damage threshold
Birefringence
Cladding
Transverse mode instability
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