Laser-intensity dependence of high-order harmonic from excited hydrogen molecular ion

Abstract

High-order harmonic generation (HHG) spectra from molecule  initially prepared in the three lowest electronic bound states, placing in an intense laser, have been obtained by numerically solving time dependent Schrödinger equation. It is found that the ratios of HHG intensities from these states strongly depend on the laser intensities. In addition, we showed that HHG emission is closely correlated with the quality  characterizing the ionization process of.