分数评估法实现光通过散射介质聚焦  

Focusing light through scattering media by score assessment algorithm

作　　者：方龙杰 程科 何修军[1] FANG Longjie;CHENG Ke;HE Xiujun(College of Optoelectronic Engineering,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学光电工程学院,四川成都610225

出　　处：《光散射学报》2023年第4期362-368,共7页The Journal of Light Scattering

基　　金：成都信息工程大学科研启动基金(KYTZ202171)。

摘　　要：为了解决强噪声环境下的相干光通过散射介质聚焦与成像问题,本文提出分数评估法,利用该方法对入射光的相位分布进行迭代优化。分数评估法的基本思想是在优化迭代过程中,通过参考目标光强值赋分的方式对相位值进行评估和考量。通过二元相位优化的方式提升迭代程序运行的速度,缩短聚焦时间,以便将该方法运用于动态散射介质。将该方法与蚁群算法对比,结果发现,分数评估法在强噪声环境下仍然能够实现散射聚焦,而蚁群算法在强噪声环境下失效。实验测得分数评估法的焦点光强是优化前散斑平均光强的71.4倍。因此,对于今后在生物成像、光电检测等应用领域,应当优先考虑使用分数评估法优化入射光的波面以提升成像或聚焦的分辨率和清晰度。In order to focus coherent light and image through scattering media in noisy environment,a score assessment algorithm is proposed to optimize the phase distribution of the incident wavefront.The basic idea of the score assessment algorithm is to mark the phase value according to the target intensity in the optimization process.Binary phase optimization is exploited to increase the speed of the program,which can be applied to dynamic scattering media.Compared with the ant colony algorithm,it is found that the score assessment algorithm can achieve a focus under strong disturbance,while the ant colony algorithm is invalid in noisy environment.In experiments,it is found that the intensity of the target signal is enhanced 71.4 times over the average speckle intensity using the score assessment algorithm.Therefore,the score assessment algorithm should be considered firstly in the application of biological imaging,photoelectric detection and other fields.

关 键 词：相位调制 散射介质 聚焦 分数评估法 

分 类 号：O436.2[机械工程—光学工程]