Phase dependence in two-color excitation of a model atom by intense fields

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Abstract
We solve numerically the one-dimensional Schrödinger equation with a model potential for the case of excitation by two commensurate (the fundamental and third harmonic) intense laser fields and find a strong dependence of the atomic evolution and high-harmonic generation on the relative phase between the two fields. Our method employs the Kramers-Henneberger frame to exploit the insights gained from emphasizing the wave-packet dynamics of an electron oscillating under the influence of the strong laser fields.