作者: T. Ackemann , Yu. A. Logvin , A. Heuer , W. Lange
DOI: 10.1103/PHYSREVLETT.75.3450
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摘要: We report the observation of transition between positive and negative hexagons by using optical pattern formation in a sodium vapor cell with feedback mirror. show that because secondary instability developed hexagon against its spatial ultraharmonics new (ultrahexagon) appears. Pattern for an incident Gaussian light beam takes place combination switching effects result flowerlike structures. The data from analytical investigations numerical simulations based on microscopic theory are good accordance experiment.