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Phys Rev Lett. 2005 Jul 8;95(2):023902. Epub 2005 Jul 8.

Stable spatiotemporal solitons in bessel optical lattices.

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1
Institute of Solid State Theory and Theoretical Optics, Friedrich-Schiller Universit├Ąt Jena, Max-Wien-Platz 1, D-077743 Jena, Germany.

Abstract

We investigate the existence and stability of three-dimensional solitons supported by cylindrical Bessel lattices in self-focusing media. If the lattice strength exceeds a threshold value, we show numerically, and using the variational approximation, that the solitons are stable within one or two intervals of values of their norm. In the latter case, the Hamiltonian versus norm diagram has a swallowtail shape with three cuspidal points. The model applies to Bose-Einstein condensates and to optical media with saturable nonlinearity, suggesting new ways of making stable three-dimensional solitons and "light bullets" of an arbitrary size.

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