Microscopic model for the higher-order nonlinearity in optical filaments

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Abstract

Using an exactly soluble one-dimensional atomic model, we explore the idea that the recently observed high-order nonlinearity in optical filaments is due to virtual transitions involving the continuum states. We show that the model's behavior is qualitatively comparable with the experimentally observed crossover from self-focusing to defocusing at high intensities, and only occurs at intensities which result in significant ionization. Based on these observations, we conjecture that this continuum electron nonlinear refraction exhibits strong memory effects and, most importantly, the change of its sign is effectively masked by the defocusing due to free electrons.

Original languageEnglish (US)
Article number065801
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume82
Issue number6
DOIs
StatePublished - Dec 17 2010

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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