650W dual-wavelength locked high brightness diode laser pump source

Xiaohua Chen; Juan Li; Min Shi; Xiaopei Dong; Fuying Li; Fangjunyue Guo; Yancong Zhang; Qian Fang; Weirong Weirong; Baohua Wang; Shengran Li; Chao Lang

doi:10.1117/12.2648594

17 March 2023 650W dual-wavelength locked high brightness diode laser pump source

Xiaohua Chen, Juan Li, Min Shi, Xiaopei Dong, Fuying Li, Fangjunyue Guo, Yancong Zhang, Qian Fang, Weirong Weirong, Baohua Wang, Shengran Li, Chao Lang

Author Affiliations +

Proceedings Volume 12402, Components and Packaging for Laser Systems IX; 124020C (2023) https://doi.org/10.1117/12.2648594
Event: SPIE LASE, 2023, San Francisco, California, United States

Conference Poster

Abstract

On last year’s SPIE conference, BWT has launched a pump source in weight around 500g, which was locked at 976nm, output 420W from a 135μm diameter and NA 0.22 fiber. In order to meet the need of higher output power pumping of fiber lasers, BWT has achieved 650W output from a 135μm diameter and NA0.22 fiber with a diode laser locked at 969nm and 982nm based on dense spatial beam combination (DSBC) and wavelength beam combination. In the absorption spectrum of Yb3+ ions, 969nm and 982nm have lower absorption coefficients than 976nm,. The active fiber with the same doping concentration will produce less heat accumulation per unit length, which has an obvious effect on improving the TMI threshold (transverse mode instability) and increasing the single-mode fiber laser power. With the enhancement of pump source brightness and the improvement of active fiber doping process and wave-guide structure, the power of single mode fiber laser directly pumped by diode laser is expected to exceed 10kW in the future.

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Xiaohua Chen, Juan Li, Min Shi, Xiaopei Dong, Fuying Li, Fangjunyue Guo, Yancong Zhang, Qian Fang, Weirong Weirong, Baohua Wang, Shengran Li, and Chao Lang "650W dual-wavelength locked high brightness diode laser pump source", Proc. SPIE 12402, Components and Packaging for Laser Systems IX, 124020C (17 March 2023); https://doi.org/10.1117/12.2648594

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