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Bessel function output from an optical correlator.

J A Davis, L L Haavig, D M Cottrell

    Applied Optics
    |April 10, 1997
    PubMed
    Summary
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    A novel optical correlator filter creates a Bessel function output, resulting in a narrower, illumination-insensitive central dark spot. This advancement improves correlation spot characteristics for optical processing applications.

    Area of Science:

    • Optics and photonics
    • Information processing

    Background:

    • Optical correlators are widely used for pattern recognition and signal processing.
    • Traditional correlator outputs can be limited by spot width and sensitivity to illumination intensity variations.

    Purpose of the Study:

    • To introduce a new filter for optical correlators.
    • To achieve a Bessel function correlation output with enhanced properties.
    • To demonstrate the filter's performance using experimental validation.

    Main Methods:

    • Development of a novel filter designed to produce Bessel function correlations.
    • Implementation of the filter onto a programmable magneto-optic spatial light modulator (MOSLM).
    • Experimental testing of the optical correlator with the new filter.

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    Main Results:

    • The new filter successfully generated a Bessel function correlation output.
    • The central dark spot in the correlation output was narrower compared to conventional methods.
    • The dark spot exhibited robustness against variations in illumination intensity.

    Conclusions:

    • The developed Bessel function filter offers significant advantages for optical correlators.
    • The narrower and more stable dark spot can enhance the precision and reliability of correlation-based systems.
    • Programmable spatial light modulators are effective platforms for implementing advanced optical filters.