title: Secondary bifurcations of hexagonal patterns in a nonlinear optical system: alkali metal vapor in a single-mirror arrangement.
abstract: Secondary bifurcations of hexagonal patterns are analyzed in a model of a single-mirror arrangement with an alkali metal vapor as the nonlinear medium. A stability analysis of the hexagonal structures is performed numerically. Different instabilities are predicted in dependency on the wave number of the hexagons. Some of the instabilities take place at a finite wave number and result in the formation of structures with 12 spatial modes. These structures are compared with those observed experimentally.
authors.affiliation: Institut Mediterrani d'Estudis Avançats, IMEDEA (CSIC-UIB), Campus Universitat Illes Balears, E-07071 Palma de Mallorca, Spain.
authors.forename: Damià
authors.initials: D
authors.lastname: Gomila
authors.forename: Thorsten
authors.initials: T
authors.lastname: Ackemann
authors.forename: Edgar
authors.initials: E
authors.lastname: Grosse Westhoff
authors.forename: Pere
authors.initials: P
authors.lastname: Colet
authors.forename: Wulfhard
authors.initials: W
authors.lastname: Lange