title: Coherent beam combination of 1.08 kW fiber amplifier array using single frequency dithering technique.
abstract: Coherent beam combination of a 1.08 kW fiber amplifier array has been demonstrated for the first time, to our knowledge. In the experiment, nine fiber amplifiers are tiled into a 3×3 array, and the output power of each amplifier is approximately 120 W. A single frequency dithering algorithm is used to compensate the phase noises between the elements, which runs on a signal processor based on field programmable gate array for phase control on the fiber amplifiers. When the phase control system goes into closed loop, the fringe contrast of the far-field intensity pattern is improved to more than 85%, and the residual phase error is less than λ/15.
authors.affiliation: College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha, China.
authors.forename: Yanxing
authors.initials: Y
authors.lastname: Ma
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
authors.forename: Jinyong
authors.initials: J
authors.lastname: Leng
authors.forename: Hu
authors.initials: H
authors.lastname: Xiao
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Dong
authors.forename: Jiajian
authors.initials: J
authors.lastname: Zhu
authors.forename: Wenbo
authors.initials: W
authors.lastname: Du
authors.forename: Pu
authors.initials: P
authors.lastname: Zhou
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Xu
authors.forename: Lei
authors.initials: L
authors.lastname: Si
authors.forename: Zejin
authors.initials: Z
authors.lastname: Liu
authors.forename: Yijun
authors.initials: Y
authors.lastname: Zhao