Internal phase control of fiber laser array based on photodetector array  

作　　者：靳凯凯 龙金虎 常洪祥 粟荣涛 张嘉怡 陈思雨 马阎星 周朴 Kai-Kai Jin;Jin-Hu Long;Hong-Xiang Chang;Rong-Tao Su;Jia-Yi Zhang;Si-Yu Chen;Yan-Xing Ma;Pu Zhou(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,China;Hunan Provincial Key Laboratory of High Energy Laser Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China [2]Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,China [3]Hunan Provincial Key Laboratory of High Energy Laser Technology,National University of Defense Technology,Changsha 410073,China

出　　处：《Chinese Physics B》2024年第7期320-326,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.62275272);the Training Program for Excellent Young Innovators of Changsha(Grant No.KQ2305025)。

摘　　要：Coherent beam combining(CBC) of fiber laser array is a promising technique to realize high output power while maintaining near diffraction-limited beam quality. To implement CBC, an appropriate phase control feedback structure should be established to realize phase-locking. In this paper, an innovative internal active phase control CBC fiber laser array based on photodetector array is proposed. The dynamic phase noises of the laser amplifiers are compensated before being emitted into free space. And the static phase difference compensation of emitting laser array is realized by interference measurement based on photodetector array. The principle of the technique is illustrated and corresponding simulations are carried out, and a CBC system with four laser channels is built to verify the technique. When the phase controllers are turned on, the phase deviation of the laser array is less than λ/20, and ~ 95% fringe contrast of the irradiation distribution is obtained. The technique proposed in this paper could provide a reference for the system design of a massive high-power CBC system.

关 键 词：fiber laser laser array coherent beam combining internal phase control 

分 类 号：TN248[电子电信—物理电子学]