Functional Yb-doped fiber with a bat-type refractive index distribution for beyond kilowatt all-fiber single-frequency laser amplification

Wei Li; Wei Liu; Yu Deng; Yisha Chen; Huan Yang; Qi Chen; Junjie Zheng; Hu Xiao; Zilun Chen; Zhiyong Pan; Pengfei Ma; Zefeng Wang; Lei Si; Shanhui Xu; Jinbao Chen

doi:10.1038/s41377-025-01956-1

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Functional Yb-doped fiber with a bat-type refractive index distribution for beyond kilowatt all-fiber single-frequency laser amplification

Original Articles

- Functional Yb-doped fiber with a bat-type refractive index distribution for beyond kilowatt all-fiber single-frequency laser amplification
- Light: Science & Applications Vol. 14, Issue 9, Pages: 2852-2860(2025)
- Affiliations：
  
  1.College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
  2.Nanhu Laser Laboratory, National University of Defense Technology, Changsha, Hunan 410073, China
  3.Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, Hunan 410073, China
  4.School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
- Author bio：
  
  Pengfei Ma (shandapengfei@126.com)
- Funds：
- DOI：10.1038/s41377-025-01956-1
  CLC：
- Received：04 November 2024，
  
  Revised：2025-05-23，
  
  Accepted：08 July 2025，
  
  Published Online：12 August 2025，
  
  Published：30 September 2025
- Accepted：
Scan QR Code
Li, W. et al. Functional Yb-doped fiber with a bat-type refractive index distribution for beyond kilowatt all-fiber single-frequency laser amplification. Light: Science & Applications, 14, 2852-2860 (2025).
DOI：

Li, W. et al. Functional Yb-doped fiber with a bat-type refractive index distribution for beyond kilowatt all-fiber single-frequency laser amplification. Light: Science & Applications, 14, 2852-2860 (2025). DOI： 10.1038/s41377-025-01956-1.

摘要

Abstract

High-power single-frequency fiber lasers with diffraction-limited spots are indispensable for a wide range of photonic applications and are particularly in advanced detection and sensing technologies. However

the simultaneous achievement of kilowatt-level output power and diffraction-limited beam quality has remained elusive in all reported single-frequency fiber laser systems to date

primarily due to limitations imposed by the stimulated Brillouin scattering (SBS) effect and transverse mode instability (TMI) effect. In this study

we demonstrate the design and manufacturing of an ultra-low numerical aperture (NA) functional Yb-doped fiber featuring a bat-type refractive index distribution

specifically engineered for single-frequency laser amplification. In the f

abrication

we implemented multiple chelate gas filling and particle deposition iterations

leading to an active fiber with a bat-type refractive index distribution. The unique capabilities of this large mode area and high-order modes leakage fiber (HOMLF) were demonstrated by stably amplifying the single-frequency laser with more than one kilowatt output power and near single mode beam quality (M

= 1.10

= 1.18) for the first time. This fiber design advances the leap forward in single-frequency fiber lasers

which could contribute as a novel and efficient laser amplification technique for the next generation of gravitational wave detection systems.

关键词

Keywords

references

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