Phase locking of slab laser amplifiers via square wave dithering algorithm.
An active phase locking of slab laser amplifiers via square wave dithering algorithm is demonstrated experimentally. The MPD technique based on dual-level square wave phase modulation, time division multiplexing, and single detector can achieve the phase error signal of amplifiers, but without coherent demodulation process. The experimental investigation on the 208 W coherent beam combining of two slab amplifiers shows that the whole system in a closed loop performs well over a long time observation. The contrast of the coherent combined beam profile is about 87% and the combining efficiency is nearly 90.4%. The beam steering with three kinds of steering angles based on coherent beam combining using square wave dithering algorithm is demonstrated numerically.
Zhimeng
Z
Huang
Xuan
X
Tang
Dayong
D
Zhang
Xiaojun
X
Wang
Jianfeng
J
Li
Cangli
C
Liu
Qingsong
Q
Gao