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Atmospheric and Oceanic Optics

2015 year, number 9

The wander and optical scintillation of focused Laguerre-Gaussian beams in turbulent atmosphere

A.V. Falits
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: лагерра-гауссов пучок, турбулентная атмосфера, блуждание пучка, флуктуации интенсивности, Laguerre-Gaussian beam, turbulent atmosphere, beam wander, scintillation


On the basis of numerical simulation of optical radiation in a turbulent medium the influence of the value of the topological charge of the optical field on the beam wander and the intensity fluctuations of focused Laguerre-Gaussian beams is investigated. The beams are considered with different values of the topological charge of the complex field and the same radius of the initial aperture. The beams have different diffraction divergence which provides spatial separation of the radiation on the receiving aperture, thereby reducing the influence of different communications channels to each other during the signal demultiplexing. It was found that the beam wandering does not depend on the value of the topological charge of the complex field, and the behavior of the intensity fluctuations is determined by the mean intensity profile, which depends on the strength of the optical turbulence.