title: Temporal response of a random medium from third-order laser speckle frequency correlations.
abstract: We demonstrate for the first time that the temporal response of a random medium can be obtained from optical intensity fluctuations. Our method uses third-order intensity correlations of measured speckle patterns from a multiple scattering random medium as a function of optical frequency. In particular, our experimental results for the temporal response extracted from third-order intensity correlations are in good agreement with the predictions of a diffusion model. Our results are valid for waves in random media where the scattered field is described by circular complex Gaussian statistics.
authors.affiliation: School of Electrical and Computer Engineering, Purdue University, 1285 Electrical Engineering Building, West Lafayette, Indiana 47907-1285, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Webster
authors.forename: K J
authors.initials: KJ
authors.lastname: Webb
authors.forename: A M
authors.initials: AM
authors.lastname: Weiner