基于分布估计算法实现散斑场聚焦  

Speckle-Field Focusing Based on Estimation of Distribution Algorithm

作　　者：黄惠玲 昌成成 韩军 Huang Huiling;Chang Chengcheng;Han Jun(Quanzhou Institute of Equipment Manufacturing,Quanzhou 362000,Fujian,China;Key Laboratory of High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,Fujian,China)

机构地区：[1]泉州装备制造研究所,福建泉州362000 [2]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [3]中国科学院福建物质结构研究所,福建福州350002

出　　处：《激光与光电子学进展》2024年第18期309-315,共7页Laser & Optoelectronics Progress

基　　金：福建省科技计划项目(2021T3032,2021T3010,2022T3068,2023T3068,2023T3090,2023T3092)。

摘　　要：当激光光束经过白漆、牛奶等强散射介质之后会发生多重散射,最终形成随机散斑。提出了一种分布估计算法,分别对入射光的振幅和相位进行调制,实现了光束经过散射介质后的聚焦。理论分析了调制单元总数和迭代次数对聚焦效果的影响,并进一步探讨了在不同噪声水平下,分别通过分布估计算法、遗传算法、粒子群优化算法和连续顺序算法等方法进行相位调制,然后观察目标位置处光强增强倍数的变化情况。结果表明,相比于其他算法,分布估计算法的调制收敛速度更快,抗噪性能更好,聚焦效果更优。When a laser beam passes through a strong scattering medium such as white paint or milk,multiple scatterings will occur,thus resulting in the formation of random speckles.In this study,a distribution-estimation algorithm was proposed to focus a beam through a scattering medium via phase and amplitude modulations.The effects of the total number of modulating units and the number of iterations on the focusing effect were analyzed theoretically.Furthermore,phase modulation was performed using distribution-estimation,genetic,particle-swarm-optimization,and continuous sequence algorithms.Subsequently,changes in the light-intensity enhancement factor at the target position were observed.The result shows that,compared with other algorithms,the distribution-estimation algorithm accelerates modulation convergence,enhances noise resilience,and offers superior focusing effects.

关 键 词：分布估计算法 聚焦 强散射介质 反馈优化算法 调制 

分 类 号：O436[机械工程—光学工程]