Abstract
Spontaneous formation of optical patterns is studied in a system composed of a photorefractive phase-conjugating medium and a virtually internal feedback mirror. In addition to ordinary regular hexagons, squares and squeezed hexagons are reported for the first time in optical pattern formation experiments. The angle of the generated sideband beams plotted as a function of the mirror position lies on two different curves, which can theoretically be explained by the contributions from two different regions of the medium separated by the virtual feedback mirror.
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