Spectral dependence of purely-Kerr driven filamentation in air and argon
Résumé
Based on numerical simulations, we show that higher-order nonlinear indices (up to n_8 and n_10, respectively) of air and argon have a dominant contribution to both focusing and defocusing in the self-guiding of ultrashort laser pulses over most of the spectrum. Plasma generation and filamentation are therefore decoupled. As a consequence, ultraviolet wavelength may not be the optimal wavelengths for applications requiring to maximize ionization.
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