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

Abstract : 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
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  • HAL Id : hal-00673420, version 1

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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, Optical Society of America, 2004, 12 (22), pp.5469-5474. ⟨hal-00673420⟩

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