Enhanced and suppressed high-order harmonic generation of H2+ by two-color circularly polarized laser field

We theoretically investigate the high-order harmonic generation (HHG) of H-2(+) molecule in the counter-rotating two-color circularly polarized laser pulse by numerically solving the two-dimensional (2D) time-dependent Schrodinger equation (TDSE). The results show that the even harmonics are suppressed with the fundamental laser wavelength 800 nm for the ratio of the second laser frequency and the fundamental laser frequency 3 or 5. In order to investigate the contributions of the HHG from two nuclei, the HHG is separated into two parts, which is originated from nucleus 1 and nucleus 2. The underlying physical mechanism of enhancing and suppressing high-order harmonic generation is illustrated by the interference effect of the HHG spectra originating from two nuclei. Meanwhile, the difference of the HHG spectra is investigated with the fundamental laser wavelength 1600 nm and 2400 nm.