摘要
为了实现光透过无序介质后在多点位置处的聚焦,并且灵活控制各聚焦点的光斑强度,本文对波前整形技术相关算法展开研究。首先,根据相干光波在无序介质中的传输过程,介绍了传统波前整形算法实现散射光场聚焦的基本原理。接着,以散射光场在两点位置处的聚焦为例,对传统方法存在的光斑亮度分布不均、强度无法调节等问题进行分析。随后,提出了一种基于权值控制的散射光场多点聚焦策略,通过引入归一化过程和权值系数方法,优化了散射子波的相位调制方案,实现对聚焦点光斑强度的灵活控制。最后,通过仿真实验对比了传统算法与权值控制算法在多点聚焦方面的表现。实验结果表明:相较于传统的波前整形算法,权值控制算法可以有效地实现散射光场在多点位置处的聚焦,并且通过改变权值系数大小,实现了对目标点光斑强度的灵活控制。证明了该方法在多目标复杂散射光场的调控研究中有着明显优势。
In order to realize focusing light at multiple points and flexibly control the spot intensity of each point after passing through the disordered medium,we delve into algorithm associated with wavefront shaping technique in this paper.Firstly,we introduced the fundamental principle of the traditional wavefront shaping algorithm for achieving focusing of the scattering light field based on the transmission process of coherent light waves within disordered media.Then,we illustrate the challenges of uneven spot brightness distribution and uncontrollable intensity inherent in the traditional approach by analyzing the focusing of scattered light fields at two-point positions as a case study.Subsequently,we proposed a multi-point focusing strategy for the scattering light field based on weight control.This strategy optimizes the phase modulation scheme of the scattering sub-waves by introducing a normalization process and a weights coefficient methodology,thereby enabling flexible control of the spot intensity at the focal point.Finally,the performance of the traditional algorithm and the weight control algorithm in multipoint focusing is compared by simulation experiments.The experimental results demonstrate that,in comparison with the conventional wavefront shaping algorithm,the weights control algorithm is capable of effectively focusing the scattering light field at multiple points,and the spot intensity can be flexibly controlled by modifying the value of the weights coefficients.It is proved that the method has evident advantages in the application of multi-target complex scattering light field regulation.
作者
牛喻颢
高瞻
符中秋
张振华
NIU Yuhao;GAO Zhan;FU Zhongqiu;ZHANG Zhenhua(Experiment and Practice Innovation Education Center,Beijing Normal University,Zhuhai,Guangdong 519087,China;Key Laboratory of Luminescence and Optical Information of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China)
出处
《光散射学报》
北大核心
2025年第4期593-598,共6页
The Journal of Light Scattering
基金
国家自然科学基金(52075034)资助。
关键词
散射介质
光场调控
反馈优化算法
多点聚焦
Scattering medium
Light field control
Feedback optimization algorithms
Multi-point focusing
