基于迈克耳孙干涉光路测量涡旋光拓扑荷数  

Measurement of vortex beams topological charge based on Michelson interferometric optical path

作　　者：李墨轩 王彦皓 谢小娜 曾梓蒙 王兆娜[1] LI Mo-xuan;WANG Yan-hao;XIE Xiao-na;ZENG Zi-meng;WANG Zhao-na(Department of Physics,Beijing Normal University,Beijing 100875,China)

机构地区：[1]北京师范大学物理学系,北京100875

出　　处：《大学物理》2024年第12期67-71,共5页College Physics

基　　金：北京市“本科生科研训练与创新创业”项目资助。

摘　　要：涡旋光因其不同拓扑荷数光场之间的正交特性在光通信、光镊等领域展示出极为重要的应用价值.其中,拓扑荷数是描述涡旋光相位分布的重要参数,对其进行调控和探测是涡旋光通讯中信息加载和提取的基础.本研究基于迈克耳孙干涉光路获得花瓣状干涉图样,并根据干涉图样和参考光场逆向恢复涡旋光场的相位分布,探测涡旋光的拓扑荷数.并考虑空间光调制器像素尺度带来的系统误差对结果进行修正,测量结果和理论结果基本一致.在此基础上,展示了分数拓扑荷光场和双奇点涡旋光场的相位恢复结果,研究结果为复杂光场中相位恢复和信息提取提供了一种可行的方法.Vortex beams exhibit extremely important applications in optical communication,optical trapping,and other fields due to the orthogonal properties between the light fields with different topological charge numbers.In particular,the topological charge number is an important parameter for describing the phase distribution of vortex beams.Controlling and detecting this number is thus the basis for information loading and extraction in vortex beam communication.In this study,the petal-shaped interference patterns are obtained and used to recover the phase distribution of vortex beams and detect the topological charge number of vortex beams based on the Michelson interference optical path.The measurement results are basically consistent with the theoretical results.Furthermore,considering the system error caused by the pixel scale of the spatial light modulator,the local phase and topological charge number are corrected.This method is also used to detect fractional topological charge and double topological charge for complex vortex beams.This work provides a feasible method for phase recovery and information extraction in complex optical light field.

关 键 词：涡旋光 拓扑荷数 迈克耳孙干涉光路 相位恢复 

分 类 号：O439[机械工程—光学工程]