An optical method is introduced for observation of temporally and spatially resolved frames that show how light propagates in diffusely scattering materials. The method permits videos with 100-fs resolution in time to be produced. The method utilizes short-coherence interferometry. The source of information is the speckle contrast. The temporal and spatial evolution of the multiple scattering process is demonstrated for several biological and industrial samples. A major objective of the method is to investigate the conditions for optimum coherence and optimum apertures to achieve high resolution in the short-coherence interferometry. One important result is that during the propagation a sharp photon horizon evolves, which is useful for the morphological analysis of volume scatterers.
© 1996 Optical Society of America
G. Häusler, J. M. Herrmann, R. Kummer, and M. W. Lindner, "Observation of light propagation in volume scatterers with 1011-fold slow motion," Opt. Lett. 21, 1087-1089 (1996)