Formation of optical vortices using coherent laser beam arrays

TL;DR

This paper proposes a method to generate optical vortex beams by coherently superimposing multiple laser beams arranged radially, analyzing how various parameters influence vortex formation through theoretical derivation and simulation.

Contribution

It introduces a new theoretical framework for generating optical vortices using coherent radial laser arrays and analyzes the effects of key parameters on vortex characteristics.

Findings

Optical vortices can be efficiently generated via coherent superposition.

The beam parameters significantly influence vortex intensity and phase.

Focusing enhances the vortex's rotational phase properties.

Abstract

We present a novel proposal to generate an optical vortex beam by using the coherent-superposition of multi-beams in a radial symmetrical configuration. In terms of the generalized Huygens-Fresnel diffraction integral, we have derived the general propagation expression for the coherent radial laser arrays. Based on the derived formulae, we have analyzed the effects of the beamlet number, the separation distance of the beamlets and the topological charge on the intensity and phase distributions of the resulted beams. Our simulation results show that optical vortices could be efficiently formed and generated due to the interference and superposition effect of all the beamlets, during the propagation process of the coherent radial laser arrays with the initial well-organized phase distributions through the free space. In the focusing system, the resulted beam near the focusing plane has the strong rotation effect with the phase helicity.