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Photonics 2018, 5(3), 16;

Determining Vortex-Beam Superpositions by Shear Interferometry

Department of Physics and Astronomy, Colgate University, Hamilton, NY 13346, USA
Departamento de Ciencias, Sección Física, Pontificia Universidad Católica del Peru, Apartado 1761, Lima, Peru
Author to whom correspondence should be addressed.
Received: 17 May 2018 / Revised: 19 June 2018 / Accepted: 11 July 2018 / Published: 14 July 2018
(This article belongs to the Special Issue Optical Angular Momentum in Nanophotonics)
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Optical modes bearing optical vortices are important light systems in which to encode information. Optical vortices are robust features of optical beams that do not dissipate upon propagation. Thus, decoding the modal content of a beam is a vital component of the process. In this work, we present a method to decode modal superpositions of light beams that contain optical vortices. We do so using shear interferometry, which presents a simple and effective means of determining the vortex content of a beam, and extract the parameters of the component vortex modes that constitute them. We find that optical modes in a beam are easily determined. Its modal content can be extracted when they are of comparable magnitude. The use of modes of well-defined topological charge, but not well-defined radial-mode content, such as those produced by phase-only encoding, are much easier to diagnose than pure Laguerre–Gauss modes. View Full-Text
Keywords: optical vortices; topological charge; shear interference; mode superposition optical vortices; topological charge; shear interference; mode superposition

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Khajavi, B.; Ureta, J.R.G.; Galvez, E.J. Determining Vortex-Beam Superpositions by Shear Interferometry. Photonics 2018, 5, 16.

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