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ICOP & ICPET 2017, 23 - : 473-476 Back to browse issues page
Simulation of perfect optical vortices generation by Fraunhofer diffraction of Bessel-Gaussian beam by Laguerre-Gaussian forked grating
Mahdi Khodadadi karahroudi * 1, Bahman Parmoon , Abolhasan Mobashery , Hossein Saghafifar
Abstract:   (937 Views)

Perfect optical vortices (POV) are beams with topological charge that their dark area is independent of topological charge unlike to Laguerre-Gaussian and Bessel-Gaussian beams. In this paper, generation of these beams with different topological charges by Fraunhofer diffraction of Bessel-Gaussian (BG) beam by Laguerre-Gaussian (LG) forked grating was shown. The diameter of POV is independent of its topological charge which is an important property of it. In this study firstly a mathematical expression that describes the BG beam diffraction by LG forked grating is obtained by using Fraunhofer diffraction integral. The results of the analytical solution of the integral indicate the presence of vortex beams with different topological charges in diffraction orders. Numerical simulation of diffraction of various BG beams with different topological charges by forked grating with topological charge , also shows generation of perfect optical vortices in diffraction orders. Interference pattern of a POV and a Gaussian beam demonstrates validity of analytical expression to determine topological charges. Also, in this paper was shown that the topological charge of POV is not dependent upon the size of vortex and order of diffraction.

Keywords: Topological charge, Diffraction, Bessel-Gaussian beam, Perfect Optical vortex
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Type of Study: Research | Subject: Special
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khodadadi karahroudi M, parmoon B, mobashery A, saghafifar H. Simulation of perfect optical vortices generation by Fraunhofer diffraction of Bessel-Gaussian beam by Laguerre-Gaussian forked grating. ICOP & ICPET. 2017; 23 :473-476
URL: http://opsi.ir/article-1-1163-en.html


Volume 23 - Back to browse issues page
انجمن اپتیک و فوتونیک ایران Optics and Photonics Society of Iran
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