Spatial frequency mixing by nonlinear charge transport in photorefractive materials

J. Limeres, M. Carrascosa, L. Arizmendi, F. Agulló-López, Peter E. Andersen

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    Abstract

    We present a theoretical investigation of the nonlinear phenomenon of spatial frequency mixing in photorefractive materials. In particular, we study the kinetics of the second harmonics and the sum and difference (combinational) gratings when two photorefractive gratings are recorded in the material. The physical origin of the new gratings is extensively discussed. The formalism is applied to investigate multiple recording in LiNbO3 as a material relevant for applications. The influence of the multiple-recording method (either sequential or simultaneous) on the generation of second-order gratings is analyzed. We found remarkable differences in the kinetics of these gratings depending on the multiplexing procedure. Our theoretical predictions are in good agreement with a number of previously reported experimental results.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume65
    Issue number10
    Pages (from-to)195117
    Number of pages8
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2002

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