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Opt Express. 2008 May 26;16(11):8213-8.

Kerr-induced spontaneous Bessel beam formation in the regime of strong two-photon absorption.

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  • 1CNISM and Dipartimento di Fisica e Matematica, Universit√† dell'Insubria, Via Valleggio 11, Como, 22100, Italy.


We study the effect of Two-Photon Absorption (TPA) nonlinear losses on Gaussian pulses, with power that exceeds the critical power for self-focusing, propagating in bulk kerr media. Experiments performed in fused silica and silicon highlight a spontaneous reshaping of the input pulse into a pulsed Bessel beam. A filament is formed in which sub-diffractive propagation is sustained by the Bessel-nature of the pulse.

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