We show that higher-order nonlinear indices (n4, n6, n8, n10) provide
the main defocusing contribution to self-channeling of ultrashort laser
pulses in air and argon at 800 nm, in contrast with the previously
accepted mechanism of filamentation where plasma was considered as the
dominant defocusing process. Their consideration allows us to reproduce
experimentally observed intensities and plasma densities in self-guided
filaments.
http://prl.aps.org/abstract/PRL/v104/i10/e103903
PPT slides and other material here
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