Abstract
The properties of patterns in an anisotropic system are studied experimentally and numerically in an optical pattern forming system with single-mirror feedback. A controlled anisotropy is introduced by a slit filter in Fourier space. If the slit width is reduced, a transition between hexagons and stripes via nonequilateral hexagons and rhomboids is observed. The scenario is reproduced in numerical simulations. The bifurcation to stripes is found to be supercritical whereas the one to hexagons is subcritical in accordance with expectation. The results illustrate the potential of Fourier filtering as a tool for investigating mechanisms of pattern formation.
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