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  • Received: Dec. 10, 2019

    Accepted: Jan. 10, 2020

    Posted: Apr. 27, 2020

    Published Online: Apr. 28, 2020

    The Author Email: Encai Ji (jec12@tsinghua.org.cn)

    DOI: 10.3788/COL202018.051404

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    Encai Ji, Jie Shi, Congwen Zha, Jing Zeng, Xinwu Zhou, Zhengdi He, Yong Yao, Qitao Lü. Ultimate capacity analysis of cladding-pumped 10/130 Tm:fiber laser[J]. Chinese Optics Letters, 2020, 18(5): 051404

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Chinese Optics Letters, Vol. 18, Issue 5, 051404 (2020)

Ultimate capacity analysis of cladding-pumped 10/130 Tm:fiber laser

Encai Ji1,2,*, Jie Shi1, Congwen Zha1,2, Jing Zeng2, Xinwu Zhou2, Zhengdi He3, Yong Yao1, and Qitao Lü2,3

Author Affiliations

  • 1School of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
  • 2Han’s Laser Technology Industry Group Co., Ltd., Shenzhen 518055, China
  • 3Sino-German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, China

Abstract

The ultimate capacity of a cladding-pumped 10/130 Tm:fiber is experimentally investigated with a 793 nm laser diode bidirectionally pumped amplifier. The laser system works stably at the output powers of 52 W, 65 W, and 87 W. Eventually, the damage of the amplifier occurs when the output power reaches about 103.5 W with a total incident pump power of 176.8 W. Considering the incident seed power of 12.3 W, the amplifier conversion efficiency is estimated to be about 51.6% before it is damaged. With valuable exploration, we achieve the first air-cooling 60 W Tm:fiber laser at 1945.845 nm with a spectral linewidth of 0.4 nm. The laser power stability reaches 1.24% during a continuous test time of >65 h. The beam quality is measured as Mx2=1.16 and My2=1.14.

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