Direct Determination of Diffusion Properties of Random Media from Speckle Contrast

TL;DR

This paper introduces a straightforward method to measure the diffusion properties of scattering media using speckle contrast from femtosecond pulse transmission, eliminating the need for complex time measurements or interferometry.

Contribution

The authors propose a novel, simple technique for characterizing diffusion properties of scattering media based solely on speckle contrast measurements.

Findings

Effective for thin, strongly scattering samples

Does not require time-resolved measurements or interferometry

Applicable to biological imaging and pulse shaping

Abstract

We present a simple scheme to determine the diffusion properties of a thin slab of strongly scattering material by measuring the speckle contrast resulting from the transmission of a femtosecond pulse with controlled bandwidth. In contrast with previous methods, our scheme does not require time measurements nor interferometry. It is well adapted to the characterization of samples for pulse shaping, non-linear excitation through scattering media and biological imaging.