A high-power narrow-linewidth 1018 nm fiber laser based on a single-mode–few-mode–single-mode structure

• Published in: High power laser science and engineering Vol. 3
• Main Authors: Jiang, Man, Zhou, Pu, Xiao, Hu, Ma, Pengfei
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 2015
• Subjects: 1018 nm laser; fiber laser
• ISSN: 2095-4719; 2052-3289
• DOI: 10.1017/hpl.2015.24

We demonstrate an all-fiber high-power Yb-doped 1018 nm fiber laser with a Gaussian-shaped output beam profile based on a mismatched structure, which consists of a pair of single-mode fiber Bragg gratings and a section of few-mode double-cladding gain fiber. The output power is up to 107.5 W with an optical-to-optical efficiency of 63%, and the 3 dB band is 0.26 nm at this power level. Such a structure of single-mode–few-mode–single-mode fiber oscillator can be used to generate high-power narrow-linewidth lasing with excellent beam quality in other spectral ranges.