title: High-power narrow-bandwidth thulium fiber laser with an all-fiber cavity.
abstract: We report diode pumped high power 2-µm Tm(3+) fiber lasers with an all-fiber configuration. The all-fiber configuration is completed by specially designed fiber Bragg gratings with similar structure parameters matched to the gain fiber. The maximum output power is 137 W with an optical-to-optical slope efficiency of 62% with respect to absorbed 793-nm pump power. The laser wavelength is stabilized at ~2019 nm with a spectral linewidth less than 3 nm across all output levels. To the best of our knowledge, this is the highest 2-µm laser output from a single narrow bandwidth all-fiber laser system.
authors.affiliation: Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics, Shanghai Jiaotong University, Shanghai 200240, China. yulong@sjtu.edu.cn
authors.forename: Yulong
authors.initials: Y
authors.lastname: Tang
authors.forename: Chongyuan
authors.initials: C
authors.lastname: Huang
authors.forename: Shengli
authors.initials: S
authors.lastname: Wang
authors.forename: Hongqiang
authors.initials: H
authors.lastname: Li
authors.forename: Jianqiu
authors.initials: J
authors.lastname: Xu