Theoretical description of the photorefractive detection of the ultrasound modulated photons in scattering media

Michel Gross (1) , François Ramaz (2) , B.C. Forget (2) , Michael Atlan (2) , Albert-Claude Boccara (2) , Philippe Delaye (3) , Gérald Roosen (3)

1 LKB (Lhomond) - Laboratoire Kastler Brossel
2 IL - Institut Langevin - Ondes et Images (UMR7587)
3 Laboratoire Charles Fabry de l'Institut d'Optique / Manolia

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

Domains: Optics [physics.optics]

Michel Gross, François Ramaz, B.C. Forget, Michael Atlan, Albert-Claude Boccara, et al.. Theoretical description of the photorefractive detection of the ultrasound modulated photons in scattering media. Optics Express, 2005, 13 (18), pp.7097-7112. ⟨hal-00671127⟩