Acousto-optical coherence tomography using random phase jumps on ultrasound and light

Max Lesaffre 1 S. Farahi 2 Michel Gross 1 Philippe Delaye 3 Claude Boccara 2 François Ramaz 2
1 LKB (Lhomond) - Laboratoire Kastler Brossel
2 Institut Langevin ondes et images
3 Laboratoire Charles Fabry de l'Institut d'Optique / Manolia
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Imaging objects embedded within highly scattering media by coupling light and ultrasounds (US) is a challenging approach. In deed, US enable direct access to the spatial localization, though resolution can be poor along their axis (cm). Up to now, several configurations have been studied, giving a millimetric axial resolution by applying to the US a microsecond pulse regime, as is the case with conventional echography. We introduce a new approach called Acousto-Optical Coherence Tomography (AOCT), enabling us to get a millimetric resolution with continuous US and light beams by applying random phase jumps on US and light. An experimental demonstration is performed with a self-adaptive holographic setup containing a photorefractive GaAs bulk crystal and a single large area photodetector.
Keywords : Photorefractive effect ultrasound detection Acousto-optical coherence tomography
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Max Lesaffre, S. Farahi, Michel Gross, Philippe Delaye, Claude Boccara, et al.. Acousto-optical coherence tomography using random phase jumps on ultrasound and light. Optics Express, Optical Society of America, 2009, 17 (20), pp.18211. ⟨hal-00554320⟩

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