Approximation methods in the problem of light propagation in 2D media with sharply anisotropic scattering

摘要

Abstract: The depth mode of light propagation in a 2D-medium withstrong absorption and sharply- anisotropic scatteringis studied analytically outside the framework of thesmall-angle diffusion approximation. We propose andrealize a regular procedure for optimum determinationof the parameters of a postulated approximate angularspectrum in the depth mode. The dispersion in the depthmode and the depth damping coefficient are found. Ourresults are in good agreement with the exact solutionto the transport equation written in thequasi-diffusion approximation, that has been obtainedrecently in the particular case of theHenyey-Greenstein phase function. !18