Coherent beam combination of 137 W fiber amplifier array using single frequency dithering technique

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• 作者：Yanxing Ma^a ; Xiaolin Wang^a ; Pu Zhou^a ; Bing He^b ; Hu Xiao^a ; Yuhao Xue^b ; Chi Liu^b ; Zhen Li^b ; Xiaojun Xu^a ; Jun Zhou^b ; Lei Si^a ; Zejin Liu^a ; ^{zejinliu@vip.sina.com"" rel=""nofollow} ; Yijun Zhao^a
• 关键词：Fiber laser ; Coherent beam combination ; Phase locking
• 刊名：Optics and Lasers in Engineering
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：49
• 期：8
• 页码：1089-1092
• 全文大小：793 K

文摘

We demonstrate coherent beam combination of 137 W fiber amplifier array using single frequency dithering technique. Four polarization-maintained fiber amplifiers are tiled into 2×2 array and the output power of each amplifier is about 35 W. Single frequency dithering algorithm is run on a signal processor based on field programmable gate array (FPGA) for phase control on the fiber amplifiers. When the phase control system goes into closed-loop, the fringe contrast of far-field intensity pattern is improved by more than 87 % from 0 in open-loop, and the residual phase error is less than λ/20.