title: Theoretical description of the photorefractive detection of the ultrasound modulated photons in scattering media.
abstract: Acousto-optic imaging of thick biological tissues can be obtained in real-time with an adaptive-wavefront holographic setup, where the holographic media is a self-developping photorefractive crystal. As a consequence, the interference signal resulting from the acousto-optic effect can be easily collected with a high etendue and fast single photodetector. We present a statistical model of the field propagating through the scattering media and show why the various acoustic frequency components contained in the speckle output pattern are uncorrelated. We then give a detailed description of the signal measured through the photorefractive effect, in order to explain the quadratic pressure response observed for the two commonly used configurations setup e.g an amplitude or a phase modulation of the ultrasound.
authors.forename: M
authors.initials: M
authors.lastname: Gross
authors.forename: F
authors.initials: F
authors.lastname: Ramaz
authors.forename: B
authors.initials: B
authors.lastname: Forget
authors.forename: M
authors.initials: M
authors.lastname: Atlan
authors.forename: A
authors.initials: A
authors.lastname: Boccara
authors.forename: P
authors.initials: P
authors.lastname: Delaye
authors.forename: G
authors.initials: G
authors.lastname: Roosen