TRANSITION BETWEEN POSITIVE AND NEGATIVE HEXAGONS IN OPTICAL-PATTERN FORMATION

被引：80

作者：

ACKEMANN, T

LOGVIN, YA

HEUER, A

LANGE, W

机构：

[1] Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, D-48149 Münster

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.75.3450

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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

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页码：3450 / 3453

页数：4

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