Spiral spectrum of anomalous vortex beams propagating in a weakly turbulent atmosphere

We study the spiral spectrum of anomalous vortex beams propagating through a turbulent atmosphere. Based on the Huygens-Fresnel integral and the Rytov approximation, the integral expression and then the analytical expression for the spiral spectrum of anomalous vortex beams in the weakly turbulent a...

Full description

Saved in:
Bibliographic Details
Published inJournal of modern optics Vol. 67; no. 6; pp. 501 - 506
Main Authors Li, Fang, Lui, Hui, Ou, Jun
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 29.03.2020
Taylor & Francis Ltd
Subjects
42.25.Dd
42.68.Bz
Angular momentum
Anomalous vortex beam
Apertures
Atmospheric turbulence
capacity
Electron beams
Gaussian beams (optics)
Integrals
Laguerre-Gaussian beam
Refractivity
spiral spectrum
Vortices
Wave propagation
Online AccessGet full text

Cover

More Information
Summary:We study the spiral spectrum of anomalous vortex beams propagating through a turbulent atmosphere. Based on the Huygens-Fresnel integral and the Rytov approximation, the integral expression and then the analytical expression for the spiral spectrum of anomalous vortex beams in the weakly turbulent atmosphere are derived. The capacity of wireless optical links using the anomalous vortex beam is obtained. It is found that the spiral spectrum of the anomalous vortex beam is less affected by turbulence than that of the Laguerre-Gaussian beam. And thus, the information capacity of wireless optical links using the anomalous vortex beam is larger than that using the Laguerre-Gaussian beam. The influence of beam order, wavelength, topological charge, propagation distance, refractive index structure constant and the radius of receiver aperture on spiral spectrum is investigated. These results contribute to reduce the disturbing effects of atmospheric turbulence on the orbital angular momentum of the vortex beam.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2020.1758815