Abstract

An expression is derived for the mutual coherence factor for a plane electromagnetic wave propagating in a region of dielectric turbulence. It is assumed that the medium is locally homogeneous and isotropic and that the scale of turbulence <i>l</i> is much larger than the wavelength λ. The formula is valid within ranges <i>L</i> determined by assuming small scattering angles (<i>L</i>«<i>l</i><sup>4</sup>/λ<sup>3</sup>) and [(2π/λ)<sup>2</sup>〈(Δ<i>n</i>)<sup>2</sup>〉<i>lL</i>]<sup>2</sup>«1 where 〈(Δ<i>n</i>)<sup>2</sup>〉 is the mean-square fluctuation of the refractive index. It is shown that this same expression can be derived within the limits of geometric optics for small separation distances.

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