Multiply scattered light correlations in an expanded temporal range

The multiple scattering of light from a Brownian particle suspension is considered for backscattering as well as transmission through a finite-thickness slab. A method for calculation of the radiative transfer propagator is developed permitting to extend significantly a range of time wherein the temporal correlation function can be found. Using the elaborated approach, numerical results are obtained in good agreement with experiment. A deviation of a correlation function initial slope from linear is shown to arise from a contribution of a finite number of scattering orders. The correlation functions for polarized and depolarized scattered light components are calculated inside and outside the backscattering cone. The transmittion correlation function is found for time intervals far exceeding a characteristic time of Brownian diffusion. A double-scattering term of the temporal correlation function is obtained that is valid for any time interval.