XXXVI Reunión Bienal de la Real Sociedad Española de Física

Stable Bessel Vortex Beams Sustained By Multiphoton Absorption In Self-focusing Kerr Media

19 jul. 2017 15:55

20m

Aula Química General (Facultad de Química (USC))

Oral parallel contribution Quantum and Non-linear Optics Quantum and Non-linear Optics

Descripción

Bessel vortex beams (BVBs) are vorticity-carrying nonlinear Bessel modes, propagation-invariant solutions of the nonlinear Schödinger equation with Kerr and multiphoton absorption (MPA) nonlinearities. As for the fundamental nonlinear Bessel beam case, their stationarity is supported by a power reservoir mechanism, which arises from its weak localization. In this work it is demonstrated how the MPA effect provides BVBs of simple and multiple topological charges with complete stability against both azimuthal breakup and collapse. A linearized stability analysis for small perturbations is used to vaticinate the stabilizing properties, and direct numerical simulations to verify the results. Furthermore, it is described how the model here proposed allows a common explanation to the three dynamical regimes previously observed in axicon-generated vortex beams propagating in nonlinear media: tubular, rotatory or specklelike filament regimes.