Time-gated holographic imaging using photorefractive media

Zunaira Ansari; Yan Gu; Mary Tziraki; Duncan Parsons-Karavassilis; Richard Jones; Paul M. W. French; David D. Nolte; Michael R. Melloch

doi:10.1117/12.407606

22 November 2000 Time-gated holographic imaging using photorefractive media

Zunaira Ansari, Yan Gu, Mary Tziraki, Duncan Parsons-Karavassilis, Richard Jones, Paul M. W. French, David D. Nolte, Michael R. Melloch

Author Affiliations +

Proceedings Volume 4160, Photon Migration, Diffuse Spectroscopy, and Optical Coherence Tomography: Imaging and Functional Assessment; (2000) https://doi.org/10.1117/12.407606
Event: EOS/SPIE European Biomedical Optics Week, 2000, Amsterdam, Netherlands

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.

Citation Download Citation

Zunaira Ansari, Yan Gu, Mary Tziraki, Duncan Parsons-Karavassilis, Richard Jones, Paul M. W. French, David D. Nolte, and 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); https://doi.org/10.1117/12.407606

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KEYWORDS

Holography

Light emitting diodes

Holograms

Optical coherence tomography

Coherence (optics)

Prisms

Laser scattering

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