中国物理B ›› 2026, Vol. 35 ›› Issue (1): 14206-014206.doi: 10.1088/1674-1056/adea59

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Generation of ultra-flat broad spectrum with stable single-pulse mode-locking in double-clad Yb-doped fiber laser

Minghui Sun(孙铭烩)1, Dongxin Gao(高懂昕)1, Yunli Yu(于芸丽)1, Wenyu Wang(王文煜)1, Qingcao Liu(刘情操)1, Weixin Liu(刘维新)2, and Yuzhai Pan(潘玉寨)1,†   

  1. 1 Department of Optoelectronics Science, Harbin Institute of Technology (Weihai), Weihai 264209, China;
    2 Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
  • 收稿日期:2025-04-18 修回日期:2025-06-13 接受日期:2025-07-01 发布日期:2026-01-09
  • 通讯作者: Yuzhai Pan E-mail:panyz@hitwh.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 12204132), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2021MF122), Shandong Province Technology- Based SME Innovation Enhancement Project (Grant No. 2024TSGC0715), and the Postgraduate Education Reform Project of Shandong Province, China (Grant No. SDYJSJGC2024107).

Generation of ultra-flat broad spectrum with stable single-pulse mode-locking in double-clad Yb-doped fiber laser

Minghui Sun(孙铭烩)1, Dongxin Gao(高懂昕)1, Yunli Yu(于芸丽)1, Wenyu Wang(王文煜)1, Qingcao Liu(刘情操)1, Weixin Liu(刘维新)2, and Yuzhai Pan(潘玉寨)1,†   

  1. 1 Department of Optoelectronics Science, Harbin Institute of Technology (Weihai), Weihai 264209, China;
    2 Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
  • Received:2025-04-18 Revised:2025-06-13 Accepted:2025-07-01 Published:2026-01-09
  • Contact: Yuzhai Pan E-mail:panyz@hitwh.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 12204132), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2021MF122), Shandong Province Technology- Based SME Innovation Enhancement Project (Grant No. 2024TSGC0715), and the Postgraduate Education Reform Project of Shandong Province, China (Grant No. SDYJSJGC2024107).

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摘要： We achieved an ultra-flat broad spectrum output with a 20-dB bandwidth of 77.85 nm in a double-clad Yb-doped fiber laser. The intensity difference between the highest and lowest points of the spectrum indicates a flatness better than 4 dB. More notably, this ultra-flat broad spectrum maintains a stable single-pulse mode-locking state. With the increase of pump power, an ultra-wide spectrum with a 20-dB bandwidth approaching 100 nm was formed at a pump power of 2.25 W. Additionally, we obtained a 9-pulse mode-locked state at another PC station with the same pump, which is the highest number of stable mode-locked pulse bursts observed so far with a first-order Raman frequency shift. This fiber laser shows its benefits of ultra-flat broad spectrum, high stability, and ease of fabrication, which provides a new method of obtaining the broadband light source for multiple practical applications.

关键词: Generation of ultra-flat broad spectrum with stable single-pulse mode-locking in double-clad Yb-doped fiber laser

Abstract: We achieved an ultra-flat broad spectrum output with a 20-dB bandwidth of 77.85 nm in a double-clad Yb-doped fiber laser. The intensity difference between the highest and lowest points of the spectrum indicates a flatness better than 4 dB. More notably, this ultra-flat broad spectrum maintains a stable single-pulse mode-locking state. With the increase of pump power, an ultra-wide spectrum with a 20-dB bandwidth approaching 100 nm was formed at a pump power of 2.25 W. Additionally, we obtained a 9-pulse mode-locked state at another PC station with the same pump, which is the highest number of stable mode-locked pulse bursts observed so far with a first-order Raman frequency shift. This fiber laser shows its benefits of ultra-flat broad spectrum, high stability, and ease of fabrication, which provides a new method of obtaining the broadband light source for multiple practical applications.

Key words: ultra-flat broad spectrum, high stability, double-clad Yb-doped fiber, mode-locked, multi-pulse bursts

中图分类号:  (Fiber lasers)

  • 42.55.Wd
42.60.Fc (Modulation, tuning, and mode locking)