Nonequilateral drifting hexagons in a strongly misaligned single-mirror system

We report on the appearance of a new type of pattern in an optical pattern- forming system consisting of sodium vapour as a nonlinear medium and a sing le feedback minor. These patterns are drifting and stationary nonequilatera l hexagons which appear if the feedback mirror is strongly tilted. They are due to the resonant coupling of static and oscillatory wavevectors lying i n different instability balloons and thus constitute a special example for the recently predicted Hopf-static structures.