D. Leduc et al., BIFURCATIONS FROM A 8-FOLD ORIENTATIONAL ORDER QUASIPATTERN IN A POLARIZATION INSTABILITY DEVICE, Optics communications, 130(1-3), 1996, pp. 181-191
The stability of the 8-fold orientational order quasipattern is studie
d both analytically and numerically. Close to the intensity threshold,
the sequence, that minimizes the free energy, displays structures bui
lt up with four, two and one modes, successively, as the linear refrac
tive index decreases. Differently, when increasing the intensity above
the threshold, the 8-fold orientational order quasipattern bifurcates
to a three mode quasiperiodic pattern, followed by a robust rhombic p
attern. A multiconical emission process is invoked to explain the occu
rrence of the rhombuses.