22 November 2000 Time-gated holographic imaging using photorefractive media
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Abstract
Photorefractive holography is a whole-field, coherence-gating technique for 3-D imaging through turbid media that offers a unique mechanism to discriminate against a background of diffuse light. In contrast to the well-established technique of optical coherence tomography, it is a whole-field imaging technique and may be implemented with light sources of arbitrary spatial coherence, including low cost LEDs and broad-stripe, multimode diode lasers. One drawback of using broadband sources, such as LEDs, for off-axis holographic imaging is the 'walk-off' resulting from the short temporal coherence length that limits the field-of-view. Furthermore, the non-collinear geometry required for off-axis holography can introduce significant image aberration. In this paper we discuss these design considerations for various sources. We have addressed the issue of walk-off for sources of arbitrary bandwidth and have designed an off-axis holographic imaging system based on a Michelson interferometer with a collinear beam geometry that minimizes aberration. In this paper we review our work with high-powered LEDs and discuss these issues associated with spatially incoherent sources. Also, we present a novel, spatially coherent, broadband diode-pumped laser source that may also find application in OCT.
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Zunaira Ansari, Zunaira Ansari, Yan Gu, Yan Gu, Mary Tziraki, Mary Tziraki, Duncan Parsons-Karavassilis, Duncan Parsons-Karavassilis, Richard Jones, Richard Jones, Paul M. W. French, Paul M. W. French, David D. Nolte, David D. Nolte, Michael R. Melloch, Michael R. Melloch, } "Time-gated holographic imaging using photorefractive media", Proc. SPIE 4160, Photon Migration, Diffuse Spectroscopy, and Optical Coherence Tomography: Imaging and Functional Assessment, (22 November 2000); doi: 10.1117/12.407606; https://doi.org/10.1117/12.407606
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