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ICOP & ICPET 2015, 21 - : 13-16 Back to browse issues page
Center of Vortex Beam Determination using Wave Front Gradients
Mohammad Yeganeh *1, Saifolllah Rasouli Dr2
1- PhD Student Institute for Advanced Studies in Basic Sciences (IASBS)
2- Associate Professor Institute for Advanced Studies in Basic Sciences (IASBS)
Abstract:   (1587 Views)
When a light beam passes through a strongly atmospheric turbulence, phase singularities appear in some points of the wave front surface. For reconstruction of these beams or extracting topological charge of a pure Laguerre-Gaussian beam, it is needed to determine the center of the vorticities. In this work, we introduce a new method for this purpose by use of the wavefront slope value data. For a case, center of vortex beam and the selected origin for the coordinate system match together, the variance of determined topological charge to be minimized. Wavefront slops can be extracted with a wavefront sensor like a two-channel moiré based wavefront sensor. In experiment, lens phase function or a white noise are added to an azimuthally dependence phase of an incident beam. This is done by use of diffraction of a plane wave from a LCD, which is used as a spatial phase modulator. In addition, we used amplitude forked grating and allow passing diffracted beam through a turbulent medium. Then, we determined centers of these beams and noted some considerations for this process.
Keywords: Laguerre-Gaussian Beam, Moiré Deflectometry, SLM, Topological Charge, Vortex Beam
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Type of Study: Research | Subject: Special
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Yeganeh M, Rasouli S. Center of Vortex Beam Determination using Wave Front Gradients. ICOP & ICPET. 2015; 21 :13-16
URL: http://opsi.ir/article-1-453-en.html
Volume 21 - Back to browse issues page
انجمن اپتیک و فوتونیک ایران Optics and Photonics Society of Iran
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