Two-beam coherent addition using the stochastic parallel gradient descent algorithm

作者：Yang, Yuchuan^*; Tan, Bitao; Lizi, Chen; Zhang, Junwei; Wang, Xiao

来源：Optical Engineering, 2013, 52(1): 014301.

DOI：10.1117/1.OE.52.1.014301

• coherent addition
• phase locking
• stochastic parallel gradient descent algorithm

The coherent addition of multiple beams is one of the great challenges in terms of large-scale lasers. Implementing the capability to generate ultra-high-focus power intensity on the focal plane places stringent requirements on the control of each beam's pointing and intra-beam phasing. The random beam-to-beam phase jumps, mainly induced by the catoptric elements' rapid vibration, should be eliminated to realize phase locking. A two-way laser beam's coherent combination test bed is designed to test the capabilities of phase-locking system. The results show that the closed-loop feedback system achieved a high contrast of the in-phase intensity pattern at the receiving plane after correcting for piston and tip/tilt errors between two adjacent laser beams by the stochastic parallel gradient descent algorithm.

• 出版日期2013-1
• 单位中国工程物理研究院; 中国工程物理研究院激光聚变研究中心; 西北核技术研究所