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Yeganeh M, Rasouli S, Aakhte M, Abdollahpour D. Generation and Measurement of Topological Charge of Composite Laguerre-Gaussian Beams using Moiré Deflectometry. ICOP & ICPET _ INPC _ ICOFS 2014; 20 :57-60
URL: http://opsi.ir/article-1-61-en.html
URL: http://opsi.ir/article-1-61-en.html
1- Institute for Advanced Studies in Basic Sciences
Abstract: (7081 Views)
In this paper, we have used a LCD as spatial light modulator to generate simple or composite Laguerre-Gaussian beams from a plane wave of a He-Ne laser beam. Moiré Deflectometry is used to measure gradients of wave-front of the vortex beam. Integral along a given closed path of gradients used to measure topological charge of the beam. We show that the sum of topological charges of all beams results overall topological charge of the composite beam. Also, the intensity and phase distribution of such beams were simulated. Comparing results of the numerical simulation and experimental results demonstrate that moiré deflectometry can be used to determine topological charge of a beam with an adequate accuracy.
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