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Proceedings Paper

Depth-resolved holography using photorefractive media
Author(s): Nicholas P. Barry; Richard Jones; Sam C. W. Hyde; Christopher Dainty; Paul M. W. French; K. M. Kwoleck; David D. Nolte; Michael R. Melloch
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Paper 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.

Paper Details

Date Published: 26 November 1996
PDF: 11 pages
Proc. SPIE 2928, Biomedical Systems and Technologies, (26 November 1996); doi: 10.1117/12.259971
Show Author Affiliations
Nicholas P. Barry, Imperial College of Science, Technology and Medicine (United Kingdom)
Richard Jones, Imperial College of Science, Technology and Medicine (United Kingdom)
Sam C. W. Hyde, Imperial College of Science, Technology and Medicine (United Kingdom)
Christopher Dainty, Imperial College of Science, Technology and Medicine (United Kingdom)
Paul M. W. French, Imperial College of Science, Technology and Medicine (United Kingdom)
K. M. Kwoleck, Purdue Univ. (United States)
David D. Nolte, Purdue Univ. (United States)
Michael R. Melloch, Purdue Univ. (United States)


Published in SPIE Proceedings Vol. 2928:
Biomedical Systems and Technologies
Nathan I. Croitoru; Martin Frenz; Terence A. King; Riccardo Pratesi; Anna Maria Verga Scheggi; Stefan Seeger; Otto S. Wolfbeis, Editor(s)

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