München 2004 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 24: Photonik in komplexen und periodischen Strukturen

Q 24.8: Vortrag

Dienstag, 23. März 2004, 18:15–18:30, HS 204

Higher-order vectorial solitons and compound states in a single-mirror feedback system — •Matthias Pesch, Edgar Große Westhoff, Thorsten Ackemann, and Wulfhard Lange — Institut für Angewandte Physik, Corrensstr. 2/4, 48149 Münster, Germany

In this report, we consider vectorial spatial solitons in a specific realization of a single-mirror feedback scheme. The nonlinear medium is sodium vapor driven by linearly polarized light. A λ/8-retardation plate is placed in the feedback loop. This system shows symmetry-breaking between spatially homogeneous elliptically polarized states of opposite helicity[1]. At some pump level both of these homogeneous branches become unstable against a modulation instability[2].

In a parameter region near this bifurcation point, we observe three different types of localized states. They rely on polarization effects and differ from each other in the number of radial oscillations. They can be switched on and off by injecting a focused address pulse of suitable polarization and spatial shape into the medium. We interpret them as the first members of a family of vectorial solitons of n-th order. Different configurations of coexisting solitons as well as compound states consisting of tightly bound single solitons are observed. Numerical simulations show a good agreement with the experimental results.

[1] T. Yabuzaki, T. Okamoto, M. Kitano, and T. Ogawa. Phys. Rev. A 29, 1964–1972 (1984).

[2] E. Große Westhoff, V. Kneisel, Yu. A. Logvin, T. Ackemann, and W. Lange. J. Opt. B: Quantum Semiclass. Opt. 2, 386–392 (2000).