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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 540-543 |
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Sabatyan A, Javidi Rishakani B. Topological charge measurement of an optical vortex. ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :540-543
URL: http://opsi.ir/article-1-2422-en.html
URL: http://opsi.ir/article-1-2422-en.html
1- Physics department, Faculty of science, Urmia University, Urmia, Iran
Abstract: (829 Views)
In this article, it is shown that one can simply measure topological charge of the optical vortex generated by means of a diffractive element through tilting the element. To this end, the element is tilted with respect to the incident beam. The tilt causes the cylindrical symmetry of the system remove so this asymmetry is because of the existence of the imposed astigmatism on the system. As a result, a number of interference fringes are formed at the focal plane. It is demonstrated that the number of the fringes is directly related to the strength of the charge. This method was employed to the fractional topological charge and realized that an extra fringe is brought to birth so its intensity is proportional to the magnitude of the fractional part of the charge.
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