We report the first observation of weak localizations effects in light scattering by a disordered solid. For a diffuse solid scatterer we predict and observe (i) multiple backscattering speckle, (ii) a coherent backscattered peak remaining after removal of this speckle by ensemble averaging, and (iii) speckle statistics which differ from those for single scattering. Computer simulations based upon the theoretical equations yield results in good agreement with experiment.

• Received 12 June 1986

DOI:https://doi.org/10.1103/PhysRevLett.57.2049