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Phys Rev Lett. 2007 Jun 29;98(26):263902. Epub 2007 Jun 29.

Nonlocal stabilization of nonlinear beams in a self-focusing atomic vapor.

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  • 1Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia.

Abstract

We show that ballistic transport of optically excited atoms in an atomic vapor provides a nonlocal nonlinearity which stabilizes the propagation of vortex beams and higher order modes in the presence of a self-focusing nonlinearity. Numerical experiments demonstrate stable propagation of higher order nonlinear states (dipole, vortices, and rotating azimuthons) over a hundred diffraction lengths, before dissipation leads to decay of these structures.

PMID:
17678091
[PubMed]
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