title: Coherent beam combination with single frequency dithering technique.
abstract: The single frequency dithering technique for coherent beam combination with one single modulation frequency and without a reference beam is presented for the first time to our knowledge. Coherent beam combination of four fiber amplifiers is successfully demonstrated by using the single-dithering technique. When the phase control system is in the closed loop, the fringe contrast of far-field intensity pattern is improved by more than 85% from 8% in open loop, and the residual phase error is less than lambda/20. Experimental results reveal that the single-dithering technique has great potential in scaling to a large number of beamlets with a simple phase control system and low cost.
authors.affiliation: College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China.
authors.forename: Yanxing
authors.initials: Y
authors.lastname: Ma
authors.forename: Pu
authors.initials: P
authors.lastname: Zhou
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
authors.forename: Haotong
authors.initials: H
authors.lastname: Ma
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