Fluctuations of orbital angular momentum of vortex laser-beam in turbulent atmosphere

Valerii P. Aksenov

doi:10.1117/12.614254

12 September 2005 Fluctuations of orbital angular momentum of vortex laser-beam in turbulent atmosphere

Valerii P. Aksenov

Proceedings Volume 5892, Free-Space Laser Communications V; 58921Y (2005) https://doi.org/10.1117/12.614254
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

This paper studies the effect of turbulence on the orbital angular momentum (OAM) of the Laguerre-Gaussian beam propagating through the atmosphere. An integral representation of laser beam OAM through the beam intensity distribution and the gradient of the medium permittivity is derived. The equations are obtained for the first OAM statistical moments: the mean and the mean square. It is shown that the OAM value, averaged over medium realizations, coincides with the OAM value in a homogeneous medium. Asymptotic equations are derived, which allow OAM fluctuations to be estimated under the extreme conditions of weak and strong turbulence, depending on the diffraction parameters of the beam. It is found that the rate of growth of OAM fluctuations increases, as the propagating beam passes from the conditions of weak turbulence to the conditions of strong turbulence.

Citation Download Citation

Valerii P. Aksenov "Fluctuations of orbital angular momentum of vortex laser-beam in turbulent atmosphere", Proc. SPIE 5892, Free-Space Laser Communications V, 58921Y (12 September 2005); https://doi.org/10.1117/12.614254

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