316 W high-brightness narrow-linewidth linearly-polarized all-fiber single-frequency laser at 1950 nm. (21st October 2021)

• Record Type: Journal Article
• Authors: Guan, Xianchao; Yang, Changsheng; Gu, Quan; Lin, Wei; Tan, Tianyi; Zhao, Qilai; Wei, Xiaoming; Yang, Zhongmin; Xu, Shanhui
• Is Part Of: Applied physics express. Volume 14:Number 11(2021)
• Publication Date: 2021-10-21
• Subjects: single-frequency -- fiber laser -- high power -- narrow linewidth; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/ac2e9b
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: Based on a three-cascaded all-fiber master oscillator power-amplifier configuration, a 1950 nm high-brightness narrow-linewidth linearly-polarized single-frequency fiber laser with an output power of 316 W and a laser linewidth of 8.4 kHz is demonstrated experimentally. With the employment of a square-coiling fiber scheme with round corners and a 20/300 μ m-core/cladding polarization-maintaining Tm 3+ -doped double-cladding fiber, the bending loss of LP11 mode is improved, thus leading the good beam quality, Mx 2 = 1.19 and My 2 = 1.17, herein. Additionally, a polarization-extinction ratio of 17.1 dB and an optical signal-to-noise ratio of >63 dB separately confirm good maintenance of linear polarization and adequate suppression of amplified spontaneous emission in the power amplification.