AN ACCURATE TECHNIQUE TO RECORD THE ANGULAR-DISTRIBUTION OF BACKSCATTERED LIGHT

We report on a new technique to record the angular distribution of lig ht which is scattered from a (disordered) material around the backscat tering direction. The technique is accurate over a large scanning rang e (500 mrad) which includes the exact backscattering direction, and th e angular resolution is high (100 mu rad). The technique is particular ly suitable for the study of coherent backscattering from very strongl y scattering random media, but it can be applied in any situation wher e the angular distribution of backscattered light is studied. It allow ed us to measure for the first time the theoretical value of two of th e enhancement factor in coherent backscattering. (C) 1995 American Ins titute of Physics.