• High Power Laser and Particle Beams
  • Vol. 36, Issue 7, 071001 (2024)
Hang Liu1,2, Hongyu Wang3, Jiawei Wang1,2, Yang Yu4..., Qianwen Zhang1,2,5, Yujun Feng1,2,*, Yinhong Sun1,2,*, Shanhui Xu3, Yanhua Lu1,2 and Chun Tang1,2|Show fewer author(s)
Author Affiliations
  • 1Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China
  • 2National Key Laboratory of Advanced Lasers and High Power Microwaves, Mianyang 621900, China
  • 3Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510600, China
  • 4Mianyang Office of the Military Representative Bureau, Equipment Department of Military Aerospace Forces, Mianyang 621000, China
  • 5Graduate School of China Academy of Engineering Physics, Beijing 100088, China
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    DOI: 10.11884/HPLPB202436.240171 Cite this Article
    Hang Liu, Hongyu Wang, Jiawei Wang, Yang Yu, Qianwen Zhang, Yujun Feng, Yinhong Sun, Shanhui Xu, Yanhua Lu, Chun Tang. 2 μm ultra-narrow linewidth fiber laser achieves 1 kW near-diffraction-limited output[J]. High Power Laser and Particle Beams, 2024, 36(7): 071001 Copy Citation Text show less

    Abstract

    Fiber lasers in the 2 μm band are widely applicated in biomedicine, environmental monitoring, nonlinear frequency conversion, as well as in laser radar and laser communications. However, the power scaling of lasers in this band are limited by low quantum efficiency, high thermal loading, and several nonlinear effect. In this study, we propose a higher-order phase modulation technique based on inverted probability tuning sequences to suppress the SBS effect, a signal laser time-domain stabilization control technique with multi-stage link auto-feedback to enhance the SRS threshold, and a fiber-based transverse-mode purification technique to control the beam quality. Finally, a two-stage main amplification structure is used to achieve an ultra-narrow linewidth near-diffraction-limited output of 1 kW at 1 950 nm, with an optical-to-optical conversion efficiency of 55.6%, linewidth of 3.8 GHz, beam quality M2 factor of about 1.2, and no transversemode instability effect.
    Hang Liu, Hongyu Wang, Jiawei Wang, Yang Yu, Qianwen Zhang, Yujun Feng, Yinhong Sun, Shanhui Xu, Yanhua Lu, Chun Tang. 2 μm ultra-narrow linewidth fiber laser achieves 1 kW near-diffraction-limited output[J]. High Power Laser and Particle Beams, 2024, 36(7): 071001
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