Tatarskii’s first book on wave propagation through the turbulent atmosphere was published in English in 1961 and describes what we refer to as the classical theory of optical turbulence. It relies on a number of simplifying assumptions, such as the assumption of locally homogeneous and isotropic, fully developed turbulence; the Corrsin-Obukhov similarity theory; Taylor’s frozen-turbulence hypothesis; and the assumption of weak scattering. In this invited presentation, we review and discuss non-classical models of optical turbulence, which account for non-classical effects and phenomena, including anisotropy, intermittency, outer-scale effects, and non-Gaussianity of refractive-index increments.
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