High-intensity two-color interference effect on atomic stabilization

Abstract

The ionization dynamics of a one-dimensional model atom in ultrastrong dichromatic $1\ensuremath{\omega}\ensuremath{-}2\ensuremath{\omega}$ laser fields is investigated in the stabilization regime. We focus on the phase control and the quantum interference effects. The diagrams of total and partial yield versus relative phase show the similar structure to that of tunneling regime, although underlying mechanism is quite different. An enhancement or suppression of the total ionization rate by more than two orders of magnitude is observed by adjusting the relative phase, which is attributed to the significant effect of quantum interference in the stabilization regime. Asymmetry on the distribution of forward and backward ionization is also observed, i.e., for a proper choice of the phase, the photoelectrons can be confined almost to one direction. All of these findings can be explained satisfactorily by the first-order high-frequency Floquet theory.