基于变形镜激光束整形系统中的相位拟合优化方法

何杰铃; 魏凌; 杨金生; 李喜琪; 何益; 张雨东

doi:doi:10.3788/lop53.020101

激光与光电子学进展, 2016, 53 (2): 020101, 网络出版: 2016-01-22

基于变形镜激光束整形系统中的相位拟合优化方法下载： 932次

Phase Fitting Optimization Method to Laser Beam Shaping System Based on Deformable Mirror

论文大纲

何杰铃 ^1,2,*魏凌 ¹杨金生 ¹李喜琪 ¹何益 ¹张雨东 ¹

作者单位

¹ 中国科学院光电技术研究所自适应光学重点实验室, 四川成都 610209

² 中国科学院大学, 北京 100049

自适应光学光学设计激光束整形相位拟合随机并行梯度下降算法 adaptive optics optical designs laser beam shaping phase fitting stochastic parallel gradient

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摘要

基于变形镜的激光束整形系统，具有控制灵活、适应性好、破坏阈值高等优点。为了提升变形镜作为相位调制元件的激光束整形系统性能，提出一种以最小二乘法拟合的驱动器控制电压为初始值的随机并行梯度下降算法优化驱动器控制电压的方法。通过驱动器正六边形排列的37 单元变形镜对不同大小的方形与圆形平顶激光束进行整形。数值仿真结果表明，在最小二乘法的基础上引入优化算法后，远场光强的目标区域均匀性及与理论光强的相似度均获得了改善，激光束整形系统性能得到提升。

Abstract

Laser beam shaping system based on deformable mirror has the advantages of control flexibility, good adaptability and high damage threshold. In order to enhance performance of the laser beam shaping system with a deformable mirror as the phase modulation element, a stochastic parallel gradient descent algorithm is proposed to further optimize control voltage, which takes the least square fitting control voltage as the initial value. Laser beam can be transformed to square and circular flat topped beam with different sizes by a 37 element deformable mirror. Numerical simulation results show that, for the far field intensity, both the uniformity of target area and the similarity to the theoretical intensity are improved, after the introduction of optimization algorithm, on the basis of the least square method. So the performance of the laser beam shaping system is also improved.descent algorithm

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何杰铃, 魏凌, 杨金生, 李喜琪, 何益, 张雨东. 基于变形镜激光束整形系统中的相位拟合优化方法[J]. 激光与光电子学进展, 2016, 53(2): 020101. He Jieling, Wei Ling, Yang Jinsheng, Li Xiqi, He Yi, Zhang Yudong. Phase Fitting Optimization Method to Laser Beam Shaping System Based on Deformable Mirror[J]. Laser & Optoelectronics Progress, 2016, 53(2): 020101.

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