Deep turbulence propagation of a Gaussian-beam wave in anisotropic non-Kolmogorov turbulence

L. C. Andrews; R. L. Phillips; R. Crabbs; T. Leclerc

doi:10.1117/12.2026405

25 September 2013 Deep turbulence propagation of a Gaussian-beam wave in anisotropic non-Kolmogorov turbulence

L. C. Andrews, R. L. Phillips, R. Crabbs, T. Leclerc

Proceedings Volume 8874, Laser Communication and Propagation through the Atmosphere and Oceans II; 887402 (2013) https://doi.org/10.1117/12.2026405
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

In the conventional Kolmogorov model of turbulence the turbulent fluctuations of the index of refraction are assumed to be statistically homogeneous and isotropic, and there is a specific mathematical form for the power spectral density of the index of refraction fluctuations. Development of the turbulent theory of passive scalar transfer has shown that although the conventional Kolmogorov spectrum model with a 11/3 power-law index is generally correct near the ground (within the inertial subrange), it constitutes only one part of the more general behavior of passive scalar transfer in a turbulent flow. Hence, deviations from the conventional Kolmogorov model are possible. In this study we develop theoretical models for beam spot size, spatial coherence, and scintillation index that are valid in weak irradiance fluctuation regimes as well as in deep turbulence, or strong irradiance fluctuation regimes. These theoretical models are based on power-law index variations 3 <α< 4 in the spatial power spectrum model of atmospheric turbulence in addition to anisotropic conditions.

Citation Download Citation

L. C. Andrews, R. L. Phillips, R. Crabbs, and T. Leclerc "Deep turbulence propagation of a Gaussian-beam wave in anisotropic non-Kolmogorov turbulence", Proc. SPIE 8874, Laser Communication and Propagation through the Atmosphere and Oceans II, 887402 (25 September 2013); https://doi.org/10.1117/12.2026405

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