分光棱镜干涉法测量涡旋光束拓扑荷

2019 , Vol. 38 >Issue 2: 28 - 32

物理实验

分光棱镜干涉法测量涡旋光束拓扑荷

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方亮( 1983—) ，女，内蒙古阿荣旗人，西北工业大学物理系助理研究员，在读博士，主要从事大学物理

收稿日期: 2018-03-05

修回日期: 2018-09-23

网络出版日期: 2019-03-29

基金资助

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

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Topological charge measurement of vortex beams based on prism interferometry

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1.School of Science，Northwestern Polytechnical University，Xi’an，Shaanxi 710072，China; 2.Exemplary Center of Physical Laboratory Education， Northwestern Polytechnical University，Xi’an，Shaanxi 710072，China

Received date: 2018-03-05

Revised date: 2018-09-23

Online published: 2019-03-29

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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.

关键词： 涡旋光束; 分光棱镜; 干涉法; 拓扑荷

方亮, 俱沛, 甘雪涛, 赵建林 . 分光棱镜干涉法测量涡旋光束拓扑荷[J]. 大学物理, 2019 , 38(2) : 28 -32 . DOI: 10.16854 /j.cnki.1000-0712.180139

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.

Key words： vortex beam; splitting prism; interferometry; topological charge

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