title: Order parameter description of walk-off effect on pattern selection in degenerate optical parametric oscillators
abstract: Degenerate optical parametric oscillators can exhibit both uniformly translating fronts and nonuniformly translating envelope fronts under the walk-off effect. The nonlinear dynamics near threshold is shown to be described by a real convective Swift-Hohenberg equation, which provides the main characteristics of the walk-off effect on pattern selection. The predictions of the selected wave vector and the absolute instability threshold are in very good quantitative agreement with numerical solutions found from the equations describing the optical parametric oscillator.
authors.affiliation: Laboratoire de Physique des Laseres, Atomes et Molecules, CNRS UMR 8523, Centre d'Etudes et de Recherches Lasers et Applications, Universite des Sciences et Technologies de Lille, UFR de Physique Bainsertion markt. P5, F-59655 Villeneuve d'As.
authors.initials: M
authors.lastname: Taki
authors.lastname: San Miguel M
authors.initials: M
authors.lastname: Santagiustina