학술논문
Topological Charge Identification of Vortex Beams Through Optical Correlation
Document Type
Periodical
Author
Source
IEEE Photonics Technology Letters IEEE Photon. Technol. Lett. Photonics Technology Letters, IEEE. 35(24):1315-1318 Dec, 2023
Subject
Language
ISSN
1041-1135
1941-0174
1941-0174
Abstract
Recently optical beams containing orbital angular momentum have gained considerable attention due to their wide range of uses. In all the applications, accurate determination of the magnitude and sign of the topological charge (TC) is very important. Different techniques for determining the vortex beam’s TC have been reported such as interferometric, diffractive, and machine learning based methods. In this letter, we demonstrate a novel technique to identify the TC of a vortex beam using the optical correlation method where a maximum average correlation height filter has been used. Unlike conventional methods, the proposed method enables instant identification of TC without manually counting the number of fringes and requires lesser datasets with simple architecture as compared to the machine learning-based method. The proposed idea is verified through both numerical simulation and experimental results with the help of fork-shaped interferometry.