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Influence of absorption on residual polarization of backscattered linearly polarized light

Study of influence of an absorption of scattering media on the residual polarization of backscattered linearly polarized light is carried out. Approximate expression describing dependence of the degree of residual linear polarization on optical properties of disordered media is obtained. Phenomenological theory of multiple scattered field formation due to superposition of partial components with different optical paths in multiply scattering medium and previously described similarity of various statistical moments of multiply scattered optical fields are used to estimate the degree of residual polarization. Suppression of partial components with large values of optical paths causes increase of this parameter for detected backscattered light. This effect is observed at the wavelengths of selective absorption of disordered media. Experimental results obtained for phantom scattering samples such as milk and in- vivo biological tissue (human skin) are presented.