title: Coherent beam combination of a hexagonal distributed high power fiber amplifier array.
abstract: We demonstrate the coherent beam combination of a hexagonal distributed high power fiber amplifier array. Six polarization-maintained fiber amplifiers are tiled into a hexagonal array by use of a novel beam combiner. The phase control signal for fiber amplifiers is generated by running a stochastic parallel gradient descent algorithm on a digital signal processor. The coherent beam combination with a total output power of 73.5 W is demonstrated. The contrast of the coherent combined beam profile is as high as 81% when the system is closed-loop controlled.
authors: College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China.
authors: Pu
authors: P
authors: Zhou
authors: Yanxing
authors: Y
authors: Ma
authors: Xiaolin
authors: X
authors: Wang
authors: Haotong
authors: H
authors: Ma
authors: Jianhua
authors: J
authors: Wang
authors: Xiaojun
authors: X
authors: Xu
authors: Zejin
authors: Z
authors: Liu