Abstract

The normalized autocorrelation function of time-varying fluctuations of light scattered multiply from a dense disordered medium is theoretically derived within the framework of a photon-diffusion approximation. The interference effect between the scattered lights traveling along the time-forward and the time-reversed paths in the medium is renormalized to a path-length distribution function. The resultant theory enables us to investigate the characteristic dependence of the relaxation time of fluctuations of multiply scattered light on the backscattering angle within the framework of a diffusion approximation. The theory derived here is confirmed fairly well by experiments.

© 1997 Optical Society of America

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