Temporal response of a random medium from third-order laser speckle frequency correlations.
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.
Webster
M A
MA
School of Electrical and Computer Engineering, Purdue University, 1285 Electrical Engineering Building, West Lafayette, Indiana 47907-1285, USA.
Webb
K J
KJ
Weiner
A M
AM