Efficient phase-locking of 60 fiber lasers by stochastic parallel gradient descent algorithm

• 作 者: Hongxiang Chang Jiachao Xi Rongtao Su Pengfei Ma Yanxing Ma Pu Zhou
• 机 构: College of Advanced Interdisciplinary Studies, National University of Defense Technology,Changsha 41
• 出 处: 中国光学快报（英文版）
• 发表日期: 2020年10期
• 关键词: coherent beam combining fiber laser laser arrays

Coherent beam combining of 60 fiber lasers by using the stochastic parallel gradient descent algorithm has been demonstrated.The functions of pinhole(s) on the power distributions in the far-field have been systematically simulated on both in-phase and out-of-phase modes.Only one photoelectric detector was used to detect the combined power in the far-field central lobe of the in-phase mode state.When the phase controller was in a closed loop,the contrast of the far-field intensity pattern was as high as ～97％ with residual phase error of ～λ/30,and ～34.7％ of the total power was contained in the central lobe.