Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2016

Robust self-trapping of vortex beams in a saturable optical medium

Résumé

We report the first observation of robust self-trapping of vortex beams propagating in a uniform condensed medium featuring local saturable self-focusing nonlinearity. Optical vortices with topological charge , that remain self-trapped over ~ 5 Rayleigh lengths, are excited in carbon disulfide using a helical light beam at 532 nm and intensities from 8 to 10 GW/cm2. At larger intensities, the vortex beams lose their stability, spontaneously breaking into two fragments. Numerical simulations based on the nonlinear Schrödinger equation including the three-photon absorption and nonpolynomial saturation of the refractive nonlinearity demonstrate close agreement with the experimental findings.

Dates et versions

hal-01388801 , version 1 (27-10-2016)

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Albert Reyna, Georges Boudebs, Boris Malomed, Cid de Araújo. Robust self-trapping of vortex beams in a saturable optical medium. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2016, 93 (1), pp.013840. ⟨10.1103/PhysRevA.93.013840⟩. ⟨hal-01388801⟩

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