High-power single-frequency fiber laser based on cascaded fiber structure

Chaodu Shi; Shijie Fu; Xun Deng; Hao Tian; Shuai Sun; Junxiang Zhang; Wei Shi; Jianquan Yao

doi:10.1117/12.2609154

4 March 2022 High-power single-frequency fiber laser based on cascaded fiber structure

Chaodu Shi, Shijie Fu, Xun Deng, Hao Tian, Shuai Sun, Junxiang Zhang, Wei Shi, Jianquan Yao

Proceedings Volume 11981, Fiber Lasers XIX: Technology and Systems; 119810M (2022) https://doi.org/10.1117/12.2609154
Event: SPIE LASE, 2022, San Francisco, California, United States

Abstract

In this paper, we report a high-power single-frequency all-fiber amplifier at 1064 nm based on cascaded hybrid active fibers. The cascaded gain fiber design, where a piece of active fiber with lower dopant concentration is spliced before the highly doped gain fiber, is proposed to effectively alleviate the thermal loads of high-power amplifier. By virtue of hybrid pump at 976 nm and 915 nm to increase the threshold of transverse mode instability (TMI) effect, an output power of 435 W is achieved from the Yb³⁺-doped fiber with large core diameter of 30 μm. The beam quality is well maintained with a M² of 1.4 even at the maximum laser power.

Conference Presentation

Citation Download Citation

Chaodu Shi, Shijie Fu, Xun Deng, Hao Tian, Shuai Sun, Junxiang Zhang, Wei Shi, and Jianquan Yao "High-power single-frequency fiber laser based on cascaded fiber structure", Proc. SPIE 11981, Fiber Lasers XIX: Technology and Systems, 119810M (4 March 2022); https://doi.org/10.1117/12.2609154

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