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Photorefractive multichannel correlator based on stoichiometric LiTaO3

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Abstract.

We demonstrate a Vander Lugt type correlator based on photorefractive stoichiometric LiTaO3 as the volume holographic material. Accurate correlator output was obtained for binary phase-modulated input images. The correlator is tested with binary amplitude- and phase-modulated input images. Phase-modulated images show a high-quality correlation, whereas amplitude-modulated images suffer in part from a photorefractive self-focusing effect. Using 100 previously stored holograms as filters, a rate of 10000 correlations/s are demonstrated. A paraxial theoretical analysis of the correlator, giving analytic expressions for the shift invariance, is also described in detail.

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Authors and Affiliations

  1. Nonlinear Optics Laboratory, Institute of Quantum Electronics, Swiss Federal Institute of Technology, ETH Hönggerberg, 8093 Zürich, Switzerland, CH

    R. Ryf, G. Montemezzani & P. Günter

  2. National Institute for Research in Inorganic Materials (NIRIM), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan, JP

    Y. Furukawa & K. Kitamura

Authors
  1. R. Ryf
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  2. G. Montemezzani
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  3. P. Günter
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  4. Y. Furukawa
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  5. K. Kitamura
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Additional information

Received: 22 November 2000 / Revised version: 9 February 2001 / Published online: 20 April 2001

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Ryf, R., Montemezzani, G., Günter, P. et al. Photorefractive multichannel correlator based on stoichiometric LiTaO3. Appl Phys B 72, 737–742 (2001). https://doi.org/10.1007/s003400100581

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  • DOI: https://doi.org/10.1007/s003400100581

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