Higher-order Kerr terms allow ionization-free filamentation in gases

Details Higher-order Kerr terms allow ionization-free filamentation in gases Higher-order Kerr terms allow ionization-free filamentation in gases

2010-11-06

arxiv.org/abs/1011.1598v1

Physical Review Letters 104, 103903 (2010)

Physics

Optics

11 pages, 6 figures (11 panels)

Scientific paper

10.1103/PhysRevLett.104.103903

We show that higher-order nonlinear indices ($n_4$, $n_6$, $n_8$, $n_{10}$) 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 to reproduce experimentally observed intensities and plasma densities in self-guided filaments.

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