Measurement of the fractional topological charge of an optical vortex beam through interference fringe dislocation

PLUTO / PLUTO-2 Spatial Light Modulators
Higher Order Modes / Optical Vortex / OAM Optical Communication Phase Measurement / Phase Retrieval
Published on:
Authors: Shikder, Allarakha & Nishchal, Naveen K.
Abstract:
“An optical vortex beam carrying fractional topological charge (TC) has become an immerging field of interest due to its unique intensity distribution and fractional phase front in a transverse plane. Potential applications include micro-particle manipulation, optical communication, quantum information processing, optical encryption, and optical imaging. In these applications, it is necessary to know the correct information of the orbital angular momentum, which is related to the fractional TC of the beam. Therefore, the accurate measurement of fractional TC is an important issue. In this study, we demonstrate a simple technique to measure the fractional TC of an optical vortex with a resolution of 0.05 using a spiral interferometer and fork-shaped interference patterns. We further show that the proposed technique provides satisfactory results in cases of low to moderate atmospheric turbulences, which has relevance in free-space optical communications.”

Restricted Access

Publication: Applied Optics
Issue/Year: Applied Optics, Volume 62; Number 10; Pages D58; 2023
DOI: 10.1364/ao.476455
Link: https://doi.org/10.1364/ao.476455

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