Photorefractive multichannel correlator based on stoichiometric LiTaO3 |
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| Authors: | R Ryf G Montemezzani P Günter Y Furukawa K Kitamura |
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| Institution: | Nonlinear Optics Laboratory, Institute of Quantum Electronics, Swiss Federal Institute of Technology, ETH H?nggerberg, 8093 Zürich, Switzerland, CH
National Institute for Research in Inorganic Materials (NIRIM), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan, JP
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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.
Received: 22 November 2000 / Revised version: 9 February 2001 / Published online: 20 April 2001 |
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| Keywords: | PACS: 42 79 Hp 42 30 Sy 42 65 Hw |
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