Abstract
We study the ellipticity dependence of the high-order harmonic generation (HOHG) when a static electric field is presented. Through investigating the corresponding classical trajectories of the electron for the harmonic generation, it is found that there exists two different mechanisms. For circularly polarized incident light the HOHG originates mainly from the recombination of the electrons to the nucleus after multiple returns. We also find that for the elliptical incidence HOHG, the application of a static electric field can generate harmonics far beyond the usual cutoff.
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