Multiple-pattern stability in a photorefractive feedback system

M. Schwab, C. Denz, M. Saffman

    Research output: Contribution to journalJournal articleResearch


    We report on the observation of a multiple-pattern stability region in a photorefractive single-feedback system. Whereas hexagonal patterns are predominant for feedback with positive diffraction length we show that a variety of stable non-hexagonal patterns are generated for certain negative diffraction lengths. For the same values of the control parameters square, rectangular, or squeezed hexagonal patterns are found alternating in time. Besides these pure states, we found a number of different mixed-pattern states. We review the linear stability analysis for this system and show that the special shape of the threshold curves in the investigated parameter region gives a first explanation for the occurrence of a multiple-pattern region.
    Original languageEnglish
    JournalApplied Physics B-Lasers and Optics
    Pages (from-to)429-433
    Publication statusPublished - 1999

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