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.
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Received: 31 July 2002 / Revised version: 30 October 2002 / Published online: 26 February 2003
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Huneus, F., Schäpers, B., Ackemann, T. et al. Optical target and spiral patterns in a single-mirror feedback scheme . Appl Phys B 76, 191–197 (2003). https://doi.org/10.1007/s00340-003-1108-8
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DOI: https://doi.org/10.1007/s00340-003-1108-8