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Pure phase correlator with photorefractive filter memory.

M Duelli, A R Pourzand, N Collings

    Optics Letters
    |January 15, 1997
    PubMed
    Summary
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    We developed a compact optical correlator using a spatial light modulator and a photorefractive crystal. This system achieves shift-invariant pattern recognition with sharp correlation peaks and good discrimination.

    Area of Science:

    • Optics and Photonics
    • Information Processing

    Background:

    • Optical correlators are crucial for pattern recognition.
    • Traditional systems face challenges with phase distortion and shift invariance.

    Purpose of the Study:

    • To investigate a novel compact inverted VanderLugt-type correlator.
    • To enhance pattern recognition capabilities by addressing phase distortions and achieving shift invariance.

    Main Methods:

    • Utilized a phase-modulating electrically addressed spatial light modulator for image Fourier transform phase display.
    • Employed a photorefractive Lithium Niobate (LiNbO3) crystal for storing reference library Fourier transforms.
    • Implemented angular hologram multiplexing for rapid data retrieval.
    • Leveraged conjugated replicas of stored templates to mitigate optical system-induced phase distortions.

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    Main Results:

    • Achieved a fully shift-invariant correlator despite crystal thickness.
    • Demonstrated good discrimination capabilities.
    • Observed sharp and distinct correlation peaks, indicating high recognition accuracy.

    Conclusions:

    • The new compact correlator configuration effectively overcomes phase distortions.
    • The system offers robust, shift-invariant pattern recognition with excellent discrimination.
    • This design presents a promising advancement in optical correlator technology.