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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.30: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Dissipative solitons on a spiral background in a single-mirror feedback scheme — •Elmar Schöbel, Florian Huneus, Thorsten Ackemann, and Wulfhard Lange — Institut für Angewandte Physik, Westfälische Wilhelms-Universität, Corrensstr. 2/4, 48149 Münster

Most dissipative solitons exist on a stationary and constant background. Here we report on the observation of solitons on a modulated oscillatory state in an optical experiment. Sodium vapor in an oblique magnetic field is irradiated by a laser beam. The transmitted light is retro-reflected into the vapor by a plane feedback mirror.

Above a certain value of the laser intensity, this system generates different structures spontaneously. The regions of existence of dissipative solitons [1] and dynamical spirals [2] overlap under suitable conditions. Then, high-amplitude dissipative solitons on a low-amplitude spiral can be observed. The properties of these coexisting structures and the range of the region of coexistence are investigated experimentally.

[1] B. Schäpers, M. Feldmann, T. Ackemann, and W. Lange. Phys. Rev. Lett. 85, 748–751 (2000).

[2] F. Huneus, B. Schäpers, T. Ackemann, and W. Lange. Appl. Phys. B 76, 191–198 (2003).