Abstract
We present experimental observations of hexagonal patterns in strongly anisotropic non-linear optical media. Close to threshold rolls are observed. As the non-linearity is increased a transition from rolls to hexagons, leading finally to a pure hexagonal state, is observed. A mean-field model, in agreement with experiments, shows that the anisotropy locks the far-field orientation of the hexagons, while leaving their rotational symmetry undisturbed.
Original language | English |
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Journal | Europhysics Letters |
Volume | 34 |
Issue number | 9 |
Pages (from-to) | 669-674 |
ISSN | 0295-5075 |
DOIs | |
Publication status | Published - 1996 |