700W single-frequency all-fiber amplifier

Chaodu Shi; Xun Deng; Shijie Fu; Quan Sheng; Peiheng Jiang; Zheng Shi; Yanyan Li; Wei Shi; Jianquan Yao

doi:10.1117/12.2650003

8 March 2023 700W single-frequency all-fiber amplifier

Chaodu Shi, Xun Deng, Shijie Fu, Quan Sheng, Peiheng Jiang, Zheng Shi, Yanyan Li, Wei Shi, Jianquan Yao

Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 1240006 (2023) https://doi.org/10.1117/12.2650003
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

In this work, a single-frequency fiber amplifier with output power of 703 W was demonstrated at 1064 nm in an all-fiber configuration. Cascaded Yb³⁺-doped fiber structure with different dopant concentration and hybrid 915/976 nm pump scheme were employed in power scaling stage to improve the gain saturation for higher transverse mode instability threshold. An overall optical efficiency of 67.5% was achieved at the maximum output power and the M² was measured to be ~1.4. A spectral linewidth of 2 kHz was achieved at the 703-W laser power, which is to the best of our knowledge, the first time that the linewidth of a kHz single-frequency fiber amplifier is characterized at such high laser power.

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Citation Download Citation

Chaodu Shi, Xun Deng, Shijie Fu, Quan Sheng, Peiheng Jiang, Zheng Shi, Yanyan Li, Wei Shi, and Jianquan Yao "700W single-frequency all-fiber amplifier", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 1240006 (8 March 2023); https://doi.org/10.1117/12.2650003

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