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Does orbital angular momentum have effect on laser's scattering by molecular atmosphere?

Wenbo Sun1,2, Yongxiang Hu3, Carl Weimer4

  • 1Science Systems and Applications Inc., Hampton, VA 23666, USA.

Journal of Quantitative Spectroscopy & Radiative Transfer
|October 22, 2019
PubMed
Summary

Lasers with orbital angular momentum (OAM) exhibit minimal scattering changes in molecular atmospheres for small particles and moderate OAM charges. This indicates OAM laser transmission is comparable to standard Gaussian beams in such environments.

Keywords:
Lasermolecular atmosphereorbital angular momentumscattering

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Area of Science:

  • Optics and Photonics
  • Atmospheric Science
  • Computational Physics

Background:

  • Lasers with orbital angular momentum (OAM) offer advanced applications in communication, sensing, and particle manipulation.
  • Understanding OAM laser interaction with atmospheric molecules is crucial for reliable transmission in these applications.

Purpose of the Study:

  • To investigate the light-scattering properties of OAM Laguerre-Gaussian (LG) beams interacting with small dielectric particles in a molecular atmosphere.
  • To determine if OAM affects light scattering in a way that impacts atmospheric transmission.

Main Methods:

  • Utilized the finite-difference time-domain (FDTD) method to simulate light scattering.
  • Calculated scattering for purely azimuthal LG beams (radial mode number = 0) by small dielectric particles.
  • FDTD method allowed for calculations with particles off the beam's central axis.

Main Results:

  • OAM had minimal effect on the scattering phase function for very small particles and non-extreme topological charges.
  • Rayleigh theory is applicable for calculating light scattering by atmospheric molecules with OAM lasers.
  • OAM laser beam transmission through a molecular atmosphere is similar to that of a regular Gaussian beam.

Conclusions:

  • The OAM of a laser does not significantly alter light scattering in a molecular atmosphere under typical conditions for small particles.
  • OAM lasers are suitable for atmospheric applications without significant loss due to molecular scattering.
  • Standard atmospheric propagation models for Gaussian beams can be applied to OAM lasers.