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Atmospheric and Oceanic Optics

2019 year, number 8

Detection of an optical vortex topological charge and coordinates by analyzing branches of an interference pattern

F.Yu. Kanev1,2, V.P. Aksenov1, F.A. Starikov3, Yu.V. Dolgopolov3, A.V. Kopalkin3, I.D. Veretekhin4
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2National Research Tomsk Polytechnic University, Tomsk, Russia
3Russian Federal Nuclear Center, Sarov, Russia
4National Research Tomsk State University, Tomsk, Russia
Keywords: вихревая оптика, оптический вихрь, особая точка волнового фронта, топологический заряд, singular optics, optical vortex, singular point of a wavefront, topological charge

Abstract

An algorithm of optical vortex detection is considered and a computer application based on the algorithm is described. A vortex is localized as a branching point of an interference pattern. As the input data for the application, a BMP-file containing an image of interferogram is used; at the output, we obtain information about the vortex topological charge and coordinates. As is shown, accuracy of the algorithm developed is not lower than that of known analogues, while the amount of information obtained is larger.