title: Single-frequency linearly polarized master-oscillator fiber power amplifier system and its application in high fill factor coherent beam combining.
abstract: In this paper we combine the master-oscillator power fiber amplifier (MOPFA), active phase-compensation, and beam-tilting techniques to demonstrate high fill factor coherent beam combining. First, we optimize a single-frequency, linearly polarized MOPFA system with high scalability and flexibility based on compact, high efficiency Yb-doped fiber amplifier chains. Second, we demonstrate high fill factor coherent beam combining of these MOPFA arrays at a 50 W level in the far field successfully. Last, the interference matrix of eight element arrays under an opened loop condition is investigated. Scaling the system to higher power can be expected by increasing the power per fiber chain and adding the number of laser channels.
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Shanghai, 201800, China. dreamer_7@mail.siom.ac.cn
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Qi
authors.forename: Chi
authors.initials: C
authors.lastname: Liu
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.forename: Qihong
authors.initials: Q
authors.lastname: Lou
authors.forename: Weibiao
authors.initials: W
authors.lastname: Chen
authors.forename: Jingxing
authors.initials: J
authors.lastname: Dong
authors.forename: Yunrong
authors.initials: Y
authors.lastname: Wei