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  • Received: Feb. 4, 2020

    Accepted: Feb. 26, 2020

    Posted: Apr. 1, 2020

    Published Online: Apr. 9, 2020

    The Author Email: Ma Pengfei (, Zhou Pu (

    DOI: 10.3788/CJL202047.0415001

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    Wenchang Lai, Pengfei Ma, Wei Liu, Long Huang, Can Li, Pu Zhou. 550-W Single-Frequency All-Fiber Amplifier with Near-Diffraction-Limited Beam Quality[J]. Chinese Journal of Lasers, 2020, 47(4): 0415001

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Chinese Journal of Lasers, Vol. 47, Issue 4, 0415001 (2020)

550-W Single-Frequency All-Fiber Amplifier with Near-Diffraction-Limited Beam Quality

Lai Wenchang, Ma Pengfei*, Liu Wei, Huang Long, Li Can, and Zhou Pu**

Author Affiliations

  • College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, Hunan 410073, China


In this study, a 550-W single-frequency all-fiber laser with near diffraction-limited beam quality is achieved by simultaneously suppressing the stimulated Brillouin scattering and mode instability effects with a long-tapered gain fiber and employing the ability of high mode instability threshold of 1030-nm signal laser. The slope efficiency of the whole amplifier is observed to be as high as 80% and the measured beam quality M2 is approximately 1.47 at the maximum output power. Further brightness scaling is limited owing to the mode instability effect.


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