High Power Laser and Particle Beams, Volume. 37, Issue 6, 061001(2025)

Fiber gas laser beyond 4 μm with output power of over 10 W

Qi Chen1,2, Zhiyue Zhou1,2, Pengfei Ma1,2, Xuanxi Li1,2, Wenxi Pei1,2, Guorui Lü1,2, Luohao Lei1,2, Jing Shi1,2, Tianyu Li1,2, and Zefeng Wang1,2、*
Author Affiliations
  • 1College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
  • 2Nan Hu Laser Laboratory, National University of Defense Technology, Changsha 410073, China
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    Mid-infrared lasers hold significant application demands in fields such as medicine, communications, and national defense. In recent years, research on mid-infrared fiber lasers has attracted extensive attention worldwide. This work demonstrates a high-power mid-infrared light source at 4.16 μm utilizing HBr gas-filled anti-resonant hollow-core fiber (AR-HCF). By employing a homemade 2 μm single-frequency fiber amplifier as the pump source and utilizing the intrinsic absorption of gas molecules to achieve population inversion, we have realized over 10 W continuous wave mid-infrared output through backward gas-filling method in large-mode-area (AR-HCF). This optimized configuration simultaneously enhances the optical-to-optical conversion efficiency and effectively suppresses thermal accumulation limitations. At the maximum incident pump power of 63.8 W, the system achieves a maximum continuous output power of 10.37 W with corresponding slope efficiency of approximately 16.8%. The beam quality measurement reveals M2<1.1 at maximum power operation. This research verifies the substantial capability of fiber gas lasers to generate high-power mid-infrared radiation, providing valuable insights for advancing the development and investigation of mid-infrared fiber laser technologies.

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    Qi Chen, Zhiyue Zhou, Pengfei Ma, Xuanxi Li, Wenxi Pei, Guorui Lü, Luohao Lei, Jing Shi, Tianyu Li, Zefeng Wang. Fiber gas laser beyond 4 μm with output power of over 10 W[J]. High Power Laser and Particle Beams, 2025, 37(6): 061001

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    Paper Information

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    Received: Apr. 25, 2025

    Accepted: May. 29, 2025

    Published Online: Jun. 23, 2025

    The Author Email: Zefeng Wang (zefengwang_nudt@163.com)

    DOI:10.11884/HPLPB202537.250096

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