title: Active phase locking of fiber amplifiers using sine-cosine single-frequency dithering technique.
abstract: The sine-cosine single-frequency dithering technique for active phase locking of fiber amplifiers is presented for the first time to our knowledge. It has twice the phase control speed as the single-frequency dithering technique. Detailed theoretical development has been presented and the relevant experiment has been done. In the experiment, nine 10 W level fiber amplifiers are tiled into 3×3 array and the total output power is about 100 W. The sine-cosine single-frequency dithering algorithm is run on a signal processor based on a field-programmable gate array for phase control on the fiber amplifiers. When the phase control system is in a closed loop, the fringe contrast of far-field intensity pattern is improved by more than 90% from 21% in an open loop, and the residual phase error is less than λ/20.
authors: College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China.
authors: Yanxing
authors: Y
authors: Ma
authors: Pu
authors: P
authors: Zhou
authors: Xiaolin
authors: X
authors: Wang
authors: Haotong
authors: H
authors: Ma
authors: Xiaojun
authors: X
authors: Xu
authors: Lei
authors: L
authors: Si
authors: Zejin
authors: Z
authors: Liu
authors: Yijun
authors: Y
authors: Zhao