Depth-resolved holography using photorefractive media

Nicholas P. Barry; Richard Jones; Sam C. W. Hyde; Christopher Dainty; Paul M. W. French; K. M. Kwoleck; David D. Nolte; Michael R. Melloch

doi:10.1117/12.259971

26 November 1996 Depth-resolved holography using photorefractive media

Nicholas P. Barry, Richard Jones, Sam C. W. Hyde, Christopher Dainty, Paul M. W. French, K. M. Kwoleck, David D. Nolte, Michael R. Melloch

Author Affiliations +

Proceedings Volume 2928, Biomedical Systems and Technologies; (1996) https://doi.org/10.1117/12.259971
Event: BiOS Europe '96, 1996, Vienna, Austria

Abstract

Various techniques, including coherence gating have been employed to discriminate against scattered light when imaging objects in a diffusing medium. We demonstrate a coherence gate using a photorefractive holographic imaging system. Using ultrashort pulse illumination, depth resolved images of three dimensional objects embedded in such a scattering medium have been obtained. We have investigated the use of bulk photorefractive crystals (Rh:BaTiO₃) and photorefractive multiple quantum well (MQW) devices as the hologram recording medium. Using a long integration time in bulk Rh:BaTiO₃, an image of a test chart has been obtained through up to 16 mean free paths (mfp) of scattering medium. Conversely a fast response time (less than 0.4 ms) has been demonstrated in the MQW device when imaging through 8 mfp of scattering medium.

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Nicholas P. Barry, Richard Jones, Sam C. W. Hyde, Christopher Dainty, Paul M. W. French, K. M. Kwoleck, David D. Nolte, and Michael R. Melloch "Depth-resolved holography using photorefractive media", Proc. SPIE 2928, Biomedical Systems and Technologies, (26 November 1996); https://doi.org/10.1117/12.259971

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