Topological charge measurement of vortex beams based on prism interferometry

FANG Liang, JU Pei, GAN Xue-tao, ZHAO Jian-lin

doi:10.16854 /j.cnki.1000-0712.180139

College Physics >

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

DOI: https://doi.org/10.16854 /j.cnki.1000-0712.180139

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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Abstract

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

Cite this article

FANG Liang, JU Pei, GAN Xue-tao, ZHAO Jian-lin . Topological charge measurement of vortex beams based on prism interferometry[J]. College Physics, 2019 , 38(2) : 28 -32 . DOI: 10.16854 /j.cnki.1000-0712.180139

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