Absolute measurement of the ultrafast nonlinear electronic and rovibrational response in H2 and D2

Abstract

The electronic, rotational, and vibrational components of the ultrafast optical nonlinearity in H2 and D2 are measured directly and absolutely at intensities up to the ionization threshold of 1014 W/cm2. As the most basic nonlinear interactions of the simplest molecules exposed to high fields, these results constitute a benchmark for high field laser-matter theory and simulation.

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