Patterns, space-time chaos and topological defects in nonlinear optics
Anno: 1992
Autori: Arecchi F.T., Boccaletti S., Giacomelli G., Puccioni GP., Ramazza PL., Residori S.
Affiliazione autori: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy
Abstract: By increasing the Fresnel number F of a ring cavity with photorefractive gain, we show the transition between a low F regime, where few modes compete with a regular (periodic alternation) or irregular (chaotic itinerancy) time patterns, and a high F regime, where many modes oscillate simultaneously, giving rise to chaotic domains spatially correlated over a length much shorter than the wavefront size (spatiotemporal chaos). Investigating the phase of the two dimensional optical field we show that, for increasing F, it is
characterized by an increasing number of topological defects. We show that the defect pattern evolves in time according to nonlinear dynamics and that the mean separation of the defects is closely related to the spatial correlation length of the field. Finally we present a theoretical model which contains the relevant physical aspects of the experiment,
and which gives numerical results in qualitative agreement with the experiment.
Giornale/Rivista: PHYSICA D-NONLINEAR PHENOMENA
Volume: 61 (1-4) Da Pagina: 25 A: 39
Parole chiavi: DYNAMICSDOI: 10.1016/0167-2789(92)90145-DCitazioni: 17dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-12Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui