Abstract

Nonlinear refractive indices of air and its constituents were measured as a function of the pulse width in a capillary used to confine the gas and to increase the interaction length. This study was carried out with nonlinear ellipse rotation measurements using an amplified Ti:sapphire laser system providing pulses at 800 nm, continuously tunable from 60  fs up to 3  ps. Due to the presence of noninstantaneous orientational response, nonlinearities in molecular gases strongly depend on the pulse width. The pulse width dependence and discrimination between instantaneous and noninstantaneous nonlinearities of air gases were obtained with a simple exponential growth model.

© 2017 Optical Society of America

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