Coherent backscattering of a picosecond pulse from a disordered medium: Analysis of the pulse shape in the time domain

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Abstract
We have studied the temporal profile of the picosecond laser pulse scattered from random media in the backward direction in two angular regions: Coherent (-1≤θ≤1 mrad) and diffuse (7.5≤θ≤9.5 mrad), using a streak camera with overall 15-ps time resolution. To give a good description of the temporal profile of the scattered pulse, in addition to a diffusion term, terms from the maximally crossed diagrams are required to account for the coherent enhancement of scattered intensity in the backward direction due to time-reversal symmetry.