Hexagons and squares in a passive nonlinear optical system.
Hexagons and squares in a passive nonlinear optical system.
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无源非线性光学系统中的六边形和正方形。
DOI：
10.1103/physreva.50.3471
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Firth
中科院分区：
文献类型：
--
作者：
Geddes;Indik;Moloney;Firth
在涉及所有三个空间维度以及时间的非线性光学系统中对图案形成进行分析和模拟。该系统在克尔介质中反向传播，对于足够的泵浦强度，会失去稳定性，形成不均匀的空间图案。我们在自聚焦介质中观察到六边形图案，在自散焦介质中观察到正方形，这与基于对称性和渐近展开的分析非常一致。
Pattern formation is analyzed and simulated in a nonlinear optical system involving all three space dimensions as well as time in an essential way. This system, counterpropagation in a Kerr medium, is shown to lose stability, for sufficient pump intensity, to a nonuniform spatial pattern. We observe hexagonal patterns in a self-focusing medium, and squares in a self-defocusing one, in good agreement with analysis based on symmetry and asymptotic expansions.