Optical target and spiral patterns in a single-mirror feedback scheme |
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Authors: | F Huneus B Schäpers T Ackemann W Lange |
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Institution: | 1.Institut für Angewandte Physik, Westf?lische Wilhelms-Universit?t Münster, Corrensstrasse 2/4, 48149 Münster, Germany,DE |
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Abstract: | Spatio-temporal structures with a regular time dependence are observed in a nonlinear optical system consisting of a sodium-vapour
cell and a single feedback mirror. Target and spiral patterns appear spontaneously in the intensity of the transmitted light
field as a result of a self-organisation process. In contrast to the results obtained in most other pattern-forming systems,
the radial motion of the waves is directed towards the centre. The emergence of oscillatory structures is traced back to a
Hopf bifurcation at a finite wave number. The preference for a radial drift motion is due to a nonlinear guiding effect which
results from phase gradients created by the inhomogeneous pump profile. The direction of the drift can be reversed by externally
applied phase gradients. The system is a striking example of a case in which the radial variation of the pump profile has
a decisive influence on pattern formation.
Received: 31 July 2002 / Revised version: 30 October 2002 / Published online: 26 February 2003
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ID="*"Corresponding author. Fax: +49-251/83-33513, E-mail: huneus@uni-muenster.de |
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Keywords: | PACS: 42 65 Sf 42 65 Jx 47 54 +r |
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