Abstract

Coherent beam combination of a $1.08\mathrm{kW}$ fiber amplifier array has been demonstrated for the first time, to our knowledge. In the experiment, nine fiber amplifiers are tiled into a $3\times 3$ array, and the output power of each amplifier is approximately $120\mathrm{W}$. 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 $\lambda /15$.

© 2011 Optical Society of America

Active phase locking of fiber amplifiers using sine–cosine single-frequency dithering technique

Yanxing Ma, Pu Zhou, Xiaolin Wang, Haotong Ma, Xiaojun Xu, Lei Si, Zejin Liu, and Yijun Zhao
Appl. Opt. 50(19) 3330-3336 (2011)

Coherent beam combination with single frequency dithering technique

Yanxing Ma, Pu Zhou, Xiaolin Wang, Haotong Ma, Xiaojun Xu, Lei Si, Zejin Liu, and Yijun Zhao
Opt. Lett. 35(9) 1308-1310 (2010)

Active phasing a nine-element 1.14 kW all-fiber two-tone MOPA array using SPGD algorithm

Xiaolin Wang, Pu Zhou, Yanxing Ma, Jingyong Leng, Xiaojun Xu, and Zejin Liu
Opt. Lett. 36(16) 3121-3123 (2011)

Coherent beam combining of fiber lasers using a CDMA-based single-frequency dithering technique

Min Jiang, Rongtao Su, Zhixin Zhang, Yanxing Ma, Xiaolin Wang, and Pu Zhou
Appl. Opt. 56(15) 4255-4260 (2017)

Target-in-the-loop coherent beam combination of 100 W level fiber laser array based on an extended target with a scattering surface

Yanxing Ma, Pu Zhou, Rumao Tao, Lei Si, and Zejin Liu
Opt. Lett. 38(7) 1019-1021 (2013)