Photorefractive detection of tagged photons in ultrasound modulated optical tomography of thick biological tissues

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

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

We present a new and simple method to obtain ultrasound modulated optical tomography images in thick biological tissues with the use of a photorefractive crystal. The technique offers the advantage of spatially adapting the output speckle wavefront by analysing the signal diffracted by the interference pattern between this output field and a reference beam, recorded inside the photorefractive crystal. Averaging out due to random phases of the speckle grains vanishes, and we can use a fast single photodetector to measure the ultrasound modulated optical contrast. This technique offers a promising way to make direct measurements within the decorrelation time scale of living tissues

Domains: Optics [physics.optics]

François Ramaz, B.C. Forget, Michael Atlan, Albert-Claude Boccara, Michel Gross, et al.. Photorefractive detection of tagged photons in ultrasound modulated optical tomography of thick biological tissues. Optics Express, 2004, 12 (22), pp.5469-5474. ⟨hal-00673420⟩