Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation

Zhao-Qi Wang, Hui Zhang, Colin M. Cartwright, Meisong Ding, Nick J. Cook, W. Allan Gillespie

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    16 Citations (Scopus)

    Abstract

    The technique of moving gratings in a photorefractive crystal is applied to the edge enhancement of objects and edge-enhanced optical correlation. The nonlinear dependence of the optimum fringe velocity on the fringe modulation and the variation of the enhancement of the diffraction efficiency with fringe modulation at a fixed fringe velocity appropriate to high fringe modulations are experimentally investigated. It is shown that the diffraction at high fringe modulations, which corresponds to the high-spatial-frequency components of the Fourier spectrum, is enhanced by a factor of approximately 3.7, whereas the diffraction at low fringe modulations is suppressed by a factor of 0.6. The proposed technique has the advantages of real-time enhancement, arbitrary selection of the spatial frequency to be enhanced, and improved stability of the output. Experimental results of the edge enhancement of objects and edge-enhanced correlation are presented.
    Original languageEnglish
    Pages (from-to)4449-4456
    Number of pages8
    JournalApplied Optics
    Volume37
    Issue number20
    DOIs
    Publication statusPublished - 1998

    Keywords

    • Optics

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