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Updated: Dec 21, 2025

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Published on: June 24, 2016
Statistical properties of a laser beam propagating in a turbulent medium
Igor Kolokolov1, Vladimir Lebedev1,2, Pavel M Lushnikov1,3
1Landau Institute for Theoretical Physics, RAS, 142432 Chernogolovka, Moscow region, Russia.
Abstract:
We examine statistical properties of a laser beam propagating in a turbulent medium. We prove that the intensity fluctuations at large propagation distances possess a Gaussian probability density function and establish quantitative criteria for realizing the Gaussian statistics depending on the laser propagation distance, laser beam waist, laser frequency, and turbulence strength. We calculate explicitly the laser envelope pair correlation function and corrections to its higher-order correlation functions breaking Gaussianity. We discuss also statistical properties of the brightest spots in the speckle pattern.
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