G. POPESCU AND A. DOGARIU, OPTICAL PATH-LENGTH SPECTROSCOPY OF WAVE PROPAGATION IN RANDOM MEDIA, OPT. LETT.. VOL. 24, 442, (1999).
We propose optical path-length spectroscopy as a new approach to obtaining information from media that exhibit multiple light scattering. By using a backscattering technique based on low-coherence interferometry, we are able to determine the optical path-length distribution for light ref lected from a random medium and to infer the value of the transport mean free path. We illustrate how a diffusion approximation model leads to a satisfactory description of depth-resolved profiles of the backscattered intensity and discuss potential applications of this technique.