title: kW-level narrow linewidth fiber amplifier seeded by a fiber Bragg grating based oscillator.
abstract: This paper demonstrates an all-fiber narrow linewidth amplifier with a seed based on narrow linewidth fiber Bragg gratings (FBGs). The fiber amplifier achieves a narrow bandwidth output of 823 W, with an opto-optic efficiency of 84.5%. The pair of FBGs in the seed configuration helps to assure a narrow linewidth of the laser as 0.08 nm. In the laser profile, we introduce a cladding stripper with a sectional structure, which realizes high pump power leakage with high efficiency. The paper also discusses the impact of seed linewidth and fiber length on the SBS threshold in a narrow bandwidth laser. Based on this analysis, we discovered ways to inhibit SBS onset and scale power output.
authors.forename: Jinping
authors.initials: J
authors.lastname: Hao
authors.forename: Hong
authors.initials: H
authors.lastname: Zhao
authors.forename: Dayong
authors.initials: D
authors.lastname: Zhang
authors.forename: Liming
authors.initials: L
authors.lastname: Zhang
authors.forename: Kun
authors.initials: K
authors.lastname: Zhang