Noise-sustained dynamics of drifting patterns in a tilted nonlinear feedback system

Abstract : We investigate experimentally the dynamics of pattern excitation in presence of an advection-like effect in a nonlinear optical system. This advection effect, created when the angle of incidence of the pump beam is not zero, causes the existence of: (i) a transition from convective to absolute instabilities, (ii) the formation of new pattern geometries, (iii) the seeding of noise-sustained structures. All these phenomena, previously observed in nonlinear Kerr-type systems, are demonstrated in our setup composed by a photorefractive nonlinear medium in a tilted feedback configuration.
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Nicolas Marsal, Delphine Wolfersberger, Marc Sciamanna, Germano Montemezzani. Noise-sustained dynamics of drifting patterns in a tilted nonlinear feedback system. ACOFT/ACOLS 2009, Sub Conference Dissipative Soliton (DS.2009), Nov 2009, Adelaide, Australia. ⟨hal-00445381⟩

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