Method for broadband spectroscopy of light transport through opaque scattering media

We present a new broadband technique for the measurement of di®use light transport throughopaque scattering media. Using the spectral correlations introduced by a scattering medium ontoa white-light supercontinuum spectrum, the di®usion constant of light is determined over a widespectral range in the visible and near infrared. Independent broadband measurements of both thetransport mean free path and the di®usion constant are used to calculate the spectral dependenceof the energy velocity in a porous GaP slab. Broadband correlation spectroscopy is found to be anexcellent tool for the characterization of random scattering media.