Propagation-invariant laser beams with an array of phase singularities

A. A. Kovalev and V. V. Kotlyar
Phys. Rev. A 103, 063502 – Published 1 June 2021

Abstract

In this work, we investigate multivortex beams with an infinite topological charge. Such optical vortices contain an array of an infinite, but countable, number of phase singularities (isolated intensity nulls), which typically have the unitary topological charge and are located either uniformly (or not uniformly) on a straight line (or on several crossing straight lines) in the beam transverse cross section. Such optical vortices are form invariant and their transverse intensity distribution is conserved on propagation, changing only in scale and rotation. The orbital angular momentum of such optical vortices is finite, since only a finite number of screw dislocations is located within the area of the notable intensity of the Gaussian beam, while the other phase singularities are in the periphery (and in the infinity), where the intensity is very small. Increasing the Gaussian beam waist radius leads to a parabolic growth of the orbital angular momentum of such beams.

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  • Received 5 February 2021
  • Accepted 17 May 2021

DOI:https://doi.org/10.1103/PhysRevA.103.063502

©2021 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

A. A. Kovalev and V. V. Kotlyar

  • Image Processing Systems Institute of the RAS – Branch of FSRC “Crystallography & Photonics” of the RAS, 151 Molodogvardeyskaya Street, Samara 443001, Russia

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Issue

Vol. 103, Iss. 6 — June 2021

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