Quasipatterns in a polarization instability

Abstract
The nonlinear analysis of the model equation for the single-feedback-mirror device with rubidium atoms predicts that a stable quasipattern of eightfold orientational order occurs in the profile of the output light beam. This pattern is numerically reproduced for different transverse shapes, either rhombohedric or circular, of the input beam. © 1996 The American Physical Society.