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

doi:10.1088/1674-1056/adea59

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.

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

Received: 18 April 2025
Revised: 13 June 2025
Accepted manuscript online: 01 July 2025

PACS:	42.55.Wd	(Fiber lasers)
	42.60.Fc	(Modulation, tuning, and mode locking)

Fund: 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).

Corresponding Authors: Yuzhai Pan
E-mail: panyz@hitwh.edu.cn

Cite this article:

Minghui Sun(孙铭烩), Dongxin Gao(高懂昕), Yunli Yu(于芸丽), Wenyu Wang(王文煜), Qingcao Liu(刘情操), Weixin Liu(刘维新), and Yuzhai Pan(潘玉寨) Generation of ultra-flat broad spectrum with stable single-pulse mode-locking in double-clad Yb-doped fiber laser 2026 Chin. Phys. B 35 014206

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

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