Optical vortex trajectory of the edge-diffracted single-charged Laguerre-Gaussian beam
arXiv:2011.04014 · doi:10.1016/j.optlaseng.2020.106504
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.
arXiv comment15 pages, 6 figures, submitted to Optics and Lasers in Engineering
References in corpus (4)
- Vortex knots in light
- Singular skeleton evolution and topological reactions in edge-diffracted circular optical-vortex beams
- Localization and migration of phase singularities in the edge-diffracted optical-vortex beams
- Displacements and evolution of optical vortices in edge-diffracted Laguerre-Gaussian beams