Abstract

Let σ² (L, k, C_n², ℓ_o) be the irradiance variance of a monochromatic spherical wave of wavelength λ and wavenumber k = 2π/λ after propagating along a path of length L. The turbulence is assumed isotropic with refractive-index structure constant C_n² and inner scale ℓ_o. Similarly let σ₁₂²(L, k₁, k₂, C_n², ℓ_o) be the irradiance correlation, <(I₁-<I₁>) (I₂-<I₂>)>/<I₁><I₂> for iradiances I₁ and I₂ from spherical waves of wavelengths λ₁, and λ₂. Let σ_LA²(L, D, C_n², ℓ_o) be the irradiance variance of radiation propagating along the same path and transmitted through a circular, uniformly-illuminated, phase-incoherent aperture of diameter D and measured using a receiving aperture of diameter D. It is assumed that D exceeds two Fresnel-zone sizes so σ_LA² is approximately independent of the optical wavenumber.

© 1987 Optical Society of America