Preprint Article Version 1 This version is not peer-reviewed

Determining Vortex-Beam Superpositions by Shear Interferometry

Version 1 : Received: 17 May 2018 / Approved: 17 May 2018 / Online: 17 May 2018 (13:26:46 CEST)

A peer-reviewed article of this Preprint also exists.

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

Journal reference: Photonics 2018, 5, 16
DOI: 10.3390/photonics5030016

Abstract

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.

Subject Areas

optical vortices; topological charge; shear interference; mode superposition

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