Mr. Paul Dean Profile

Paul Dean

at Univ of Manchester

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Proceedings Article | 8 July 2003 Paper

Optical coherence tomography using a photorefractive polymer composite

Paul Dean, Mark Dickinson, David West

Proceedings Volume 4956, (2003) https://doi.org/10.1117/12.478994

KEYWORDS: Photorefractive polymers, Optical coherence tomography, Polymers, Composites, Holograms, Holography, Modulation, Beam splitters, Electro optics, Speckle

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We report on the possibility of using a photorefractive polymer composite device as a coherence gate for optical coherence tomography. Such a system could enable high-resolution 3-dimensional images of tissue samples to be holographically stored, and read out in real-time, or at a subsequent time. A free space system based on the Michelson interferometer is used to illuminate a photorefractive polymer device with two coherent beams. Interference of these beams results in an intensity distribution, which is consequently stored as a refractive index hologram inside the polymer. The image-carrying object beam is then reproduced from the first order diffraction of a probe beam through the device, and is captured on a CCD camera. Devices used are based on a poly(N-vinylcarbazole) (PVK):2,4,7-trinitro-9-fluorenone dimalenitrile (TNFDM) charge transport network with the electro-optic organic chromophore 1-(2'-ethylhexyloxy)-2,5-dimethyl-4-(4"-nitrophenylazo)benzene (EHDNPB). Using a 1% concentration of TNFDM, whole-field 2-dimensional image planes are successfully recorded in a few seconds with a 7mW HeNe laser at 633nm. Readout of the hologram is also performed using the same source.

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