Self-focusing of femtosecond diffraction-resistant vortex beams in water

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Abstract

We report experiments on self-focusing of femtosecond diffraction-resistant vortex beams in water. These beams are higher-order Bessel beams with weak azimuthal modulation of the transverse intensity patterns. The modulation overrides the self-focusing dynamics and results in the formation of regular bottlelike filament distributions. The peak-power thresholds for filamentation, at a particular distance, are relatively accurately estimated by the adaptation of the Marburger formula derived earlier for Gaussian beams. The nonlinear conversion of the incident conical waves into the localized spatial wave packets propagating near the beam axis is observed.

Original languageEnglish (US)
Pages (from-to)3834-3836
Number of pages3
JournalOptics letters
Volume36
Issue number19
DOIs
StatePublished - Oct 1 2011

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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