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Depth-resolved holography through turbid media using photorefraction

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8 Author(s)
S. C. W. Hyde ; Dept. of Phys., Imperial Coll. of Sci., Technol. & Med., London, UK ; R. Jones ; N. P. Barry ; J. C. Dainty
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A technique based on photorefractive holography for imaging objects obscured by a scattering medium is presented. Using ultrashort pulse illumination, depth-resolved whole-field images of three dimensional objects embedded in scattering media have been obtained. Bulk photorefractive crystals and photorefractive multiple quantum-well (MQW) devices have been investigated as the hologram recording element. Images have been obtained through media of up to 16 scattering mean free paths with a system based on bulk rhodium-doped barium titanate (Rh:BaTiO3). Using MQW devices, a real-time image acquisition (<0.4 ms) has been demonstrated when imaging through eight scattering mean free paths. The relative merits of photorefractive holography are discussed, including its potential to provide a higher dynamic range of detection than traditional photographic film based or electronic holography. This could be important for in vivo imaging through biological tissue

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IEEE Journal of Selected Topics in Quantum Electronics  (Volume:2 ,  Issue: 4 )