2-STREAM THEORY OF DIFFUSING LIGHT SPECTROSCOPIES

A theory for the propagation of light through a randomly scattering sl ab is developed that does not take advantage of a diffusion approximat ion but can be solved analytically. The treatment allows for scatterin g anisotropy and boundary reflectivity to be incorporated in a straigh tforward fashion for slabs of arbitrary thickness. Predictions are fou nd for both the transmission probability and the electric field autoco rrelation function which, respectively, can be used to analyze diffuse -transmission spectroscopy and diffusing-wave spectroscopy data more a ccurately.