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

作者：Ma, Yanxing; Zhou, Pu; Wang, Xiaolin; Ma, Haotong; Xu, Xiaojun; Si, Lei; Liu, Zejin^*; Zhao, Yijun

来源：Applied Optics, 2011, 50(19): 3330-3336.

DOI：10.1364/AO.50.003330

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 x 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 lambda/20.

• 出版日期2011-7-1
• 单位中国人民解放军国防科学技术大学