Femtosecond filmentation in air and higher-order nonlinearities

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57 Scopus citations


According to a recent experiment, the instantaneous electronic Kerr effect in air exhibits a strong intensity dependence, the nonlinear refractive index switching sign and crossing over from a self-focusing to a defocusing nonlinearity. A subsequent theoretical work has demonstrated that this has paradigm-changing consequences for the understanding of filamentation in air, so it is important to subject the idea of higher-order nonlinearities to stringent tests. Here we use numerical modeling to propose an experiment capable of discriminating between the standard and the new intensity-dependent Kerr-effect models.

Original languageEnglish (US)
Pages (from-to)2550-2552
Number of pages3
JournalOptics letters
Issue number15
StatePublished - Aug 1 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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