Coherent beam combination of a hexagonal distributed high power fiber amplifier array.
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.
Zhou
Pu
P
College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China.
Ma
Yanxing
Y
Wang
Xiaolin
X
Ma
Haotong
H
Wang
Jianhua
J
Xu
Xiaojun
X
Liu
Zejin
Z