Two-Colour Effect on the Ionization and Harmonic Generation ofOne-Dimensional He⁺

Using the one-demensional ion mode, We theoretically investigate the dynamics ionization process and the high-order harmonic generation of the He⁺ subject to different kinds of two-colour laser pulse with the same fundamental frequency but various harmonic frequencies. It is found that from the results calculated by numerically solving the time-dependent Schrödinger equation, the two-colour laser pulse with the fundamental frequency and harmonic frequency enables the power spectrum of high-order harmonic generation to increase by a few orders of magnitude and the yield of He⁺ to enhance significantly when the harmonic frequency of laser pulse is close to the energy interval between the ground state and the first excited state of He⁺; even the harmonic field added into the pulse is much weaker than the fundamental one.