Optical vortex trajectory of the edge-diffracted single-charged Laguerre-Gaussian beam

TL;DR

This paper analytically investigates the behavior of optical vortex trajectories in edge-diffracted Laguerre-Gaussian beams, revealing universal parameters and equations for vortex migration, aiding in solving inverse diffraction problems.

Contribution

It introduces analytical models for OV trajectories in edge diffraction of Laguerre-Gaussian beams, including parametric equations and conditions for weak diffraction perturbation.

Findings

Derived parametric equations for OV dislocation based on beam screening

Identified universal parameters determining OV spiral trajectories

Established a basis for inverse diffraction problem solving

Abstract

The paper deals with the edge diffraction of the single charged Laguerre-Gaussian beam outside the waist. Based on the Kirchhoff-Fresnel integral, the behavior of the optical vortex (OV) migration during sequential beam blocking by the straight edge of the screen is performed analytically. Universal combination of the diffracting-beam parameters determining the shape for the OV spiral trajectories is revealed. Parametric equations describing the OV dislocation dependent on the beam screening degree are derived. In addition, the spiral trajectory, which describes the OV positions in the case of the screen-edge translatory motion across the incident beam under conditions of the weak diffraction perturbation, is obtained. As a result, the equation for a wider region of diffraction perturbation is selected as a best matching function for a certain variation interval of the beam parameters. The work has prepared the basis for solving the inverse diffraction problem: determining parameters of the beam diffractive interaction with obstacles from the migration trajectory of the optical vortex.