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Proceedings Paper

Time-gated holographic imaging using photorefractive materials
Author(s): Sam C. W. Hyde; Nicholas P. Barry; Richard Jones; Christopher Dainty; Paul M. W. French; Barry A. Wechsler; Marvin B. Klein
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Paper Abstract

We present results for real-time holographic imaging in the medical imaging window (approximately 650 to 1000 nm) using photorefractive media. By recording holograms of a USAF test chart using a Ti:sapphire laser, we have selected the coherent)mostly ballistic) light and formed an image through a scattering medium which simulates biological tissue. The advantage of this approach is that a 2D image may be acquired in 'real time', i.e. without scanning. This will permit electronic signal processing and averaging, which may be used to reduce the deleterious effects of speckle. If the holograom is written with ultrashort pulses, then time-gated imaging is possible. This may be used to provide depth information by recording the 'time of flight' of the image light. We have recorded such holograms with picosecond pulses and present time-gated image data.

Paper Details

Date Published: 30 May 1995
PDF: 9 pages
Proc. SPIE 2389, Optical Tomography, Photon Migration, and Spectroscopy of Tissue and Model Media: Theory, Human Studies, and Instrumentation, (30 May 1995); doi: 10.1117/12.210011
Show Author Affiliations
Sam C. W. Hyde, Imperial College of Science, Technology and Medicine (United Kingdom)
Nicholas P. Barry, Imperial College of Science, Technology and Medicine (United Kingdom)
Richard Jones, 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)
Barry A. Wechsler, Hughes Research Labs. (United States)
Marvin B. Klein, Hughes Research Labs. (United States)


Published in SPIE Proceedings Vol. 2389:
Optical Tomography, Photon Migration, and Spectroscopy of Tissue and Model Media: Theory, Human Studies, and Instrumentation
Britton Chance; Robert R. Alfano, Editor(s)

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