激光相干合成系统中基于自适应随机扰动电压的SPGD优化算法  

Optimization of SPGD Algorithm Based on Adaptive Random Perturbation Voltages in Coherent Beam Combining

作　　者：祁家琴 郑文慧 江文隽 谭贵元 钟丽云 邸江磊 吴小龑[4] 刘国栋 秦玉文[1,2,3] Qi Jiaqin;Zheng Wenhui;Jiang Wenjun;Tan Guiyuan;Zhong Liyun;Di Jianglei;Wu Xiaoyan;Liu Guodong;Qin Yuwen(Institute of Advanced Photon Technology,School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Key Laboratory of Synsensory Fusion Photonics Technology,Ministry of Education,Guangzhou 510006,Guangdong,China;Guangdong Provincial Key Laboratory of Information Photonics Technology,Guangzhou 510006,Guangdong,China;Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,Sichuan,China)

机构地区：[1]广东工业大学信息工程学院先进光子技术研究院,广东广州510006 [2]通感融合光子技术教育部重点实验室,广东广州510006 [3]广东省信息光子技术重点实验室,广东广州510006 [4]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《激光与光电子学进展》2024年第15期214-222,共9页Laser & Optoelectronics Progress

基　　金：国家重点研发计划资助(2021YFB2900903);国家自然科学基金(62075183,62175041);广东省“珠江人才计划”引进创新创业团队(2021ZT09X044,2019ZT08X340)。

摘　　要：随机并行梯度下降(SPGD)算法是目前对激光相干合成系统进行精准相位控制的高效方法之一,然而,SPGD算法的控制带宽随着参与合成的激光路数的增加而迅速降低。为满足大规模激光相干合成系统相控的高带宽需求,提出一种基于自适应随机扰动电压的SPGD优化算法——Piecewise SPGD算法,采用变化的随机扰动电压并对增益系数进行分段取值。使用该算法对含有不同激光路数的相干合成系统进行实验仿真,结果表明,针对7路激光相干合成实验,优化后算法的收敛速度和稳定性相比传统SPGD算法分别提高了36.4%和70.6%,性能获得显著提升。此外,Piecewise SPGD算法无须进行参数调整即可扩展到其余路数的激光相干合成系统中,通用性强且性能良好。The stochastic parallel gradient descent(SPGD)algorithm is one of the most efficient methods for enabling the precise phase control of laser coherent synthesis systems.However,the control bandwidth of the SPGD algorithm rapidly decreases with an increase in the number of laser paths involved in the synthesis.To meet the high bandwidth requirements of the phase control in large-scale laser coherent synthesis systems,this study proposes an SPGD optimization algorithm based on the adaptive random disturbance voltage,that is,Piecewise SPGD algorithm.The proposed algorithm uses a variable random disturbance voltage to segment the gain coefficient.The experimental simulations of coherent synthesis systems with different laser paths are conducted using the proposed algorithm.The results show that in experiments with seven laser paths,the convergence speed and stability of the optimized algorithm are improved by 36.4%and 70.6%compared with those of the traditional SPGD algorithm,respectively,and the performance is significantly improved.The proposed Piecewise SPGD algorithm can be extended to other laser coherent synthesis systems without parameter adjustment for strong universality and good performance of the phase control.

关 键 词：相干合成 相位控制 高能激光 随机并行梯度下降算法 

分 类 号：TN249[电子电信—物理电子学]