分光棱镜干涉法测量涡旋光束拓扑荷  

Topological charge measurement of vortex beams based on prism interferometry

作　　者：方亮 俱沛[1] 甘雪涛 赵建林 FANG Liang;JU Pei;JU Pei;GAN Xue-tao(School of Science, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China;Exemplary Center of Physical Laboratory Education,)

机构地区：[1]西北工业大学理学院,陕西西安710072 [2]西北工业大学物理实验教学示范中心,陕西西安710072

出　　处：《大学物理》2019年第2期28-32,共5页College Physics

基　　金：国家自然科学基金(61775183);国家重点研发计划(2017YFA0303800)资助

摘　　要：理论分析并实验研究了涡旋光束通过单分光棱镜后的自干涉现象.研究结果表明,不同于涡旋光束与平面波或者球面波干涉,涡旋光束自干涉条纹呈"扭曲"状,且在干涉条纹边缘处会出现"断裂"条纹,其数目随着涡旋拓扑荷数增大而增大,且"断裂"条纹的指向与拓扑荷符号相关.上述结论提供了一种原理和操作简单的测量涡旋光束拓扑荷数的方法.The self-interference phenomenon of a vortex beam passing through a single splitting prism is analyzed theoretically and studied experimentally. The results show that the self-interference fringes of the vortex beams are twisted, which are different from the interference of a vortex beam with a plane or spherical wave. At the edge of the interference fringes, the number of fracture stripes will increase with the increase of the vortex topological charge, and the direction of the fracture stripe is determined by the symbol of topological charge. The above conclusion provides a new method for measuring the topological charges of vortex beams in a simple way.

关 键 词：涡旋光束 分光棱镜 干涉法 拓扑荷 

分 类 号：O436.1[机械工程—光学工程]