title: Polarization self-selection in a coherent beam combination system with an all-optical feedback loop.
abstract: Polarization self-selection in passive phasing of four fiber amplifiers with an all-optical feedback loop is demonstrated. The polarization extinction ratio (PER) of the combined beam is increased, and the polarized direction is selected with the use of a polarization-maintaining (PM) isolator and some non-PM components. The best visibility of the interference patterns is observed at 95.2% and in the largest increment in the PER of the combined beam up to 7.4 dB. Results show that all PM components are unnecessary in the coherent beam combination with an all-optical feedback loop, whereas non-PM components have good potential to achieve high output power.
authors.affiliation: Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China.
authors.forename: Houkang
authors.initials: H
authors.lastname: Liu
authors.forename: Bing
authors.initials: B
authors.lastname: He
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.forename: Chi
authors.initials: C
authors.lastname: Liu
authors.forename: Jingxing
authors.initials: J
authors.lastname: Dong
authors.forename: Yunrong
authors.initials: Y
authors.lastname: Wei
authors.forename: Qihong
authors.initials: Q
authors.lastname: Lou