Abstract

Nonsequential double ionization is theoretically investigated in the counter-rotating two-color [frequencies (ω1,ω2)] circularly polarized laser fields with classical ensemble approach. It is found that remarkable ionization enhancement is obtained by adjusting the relative electric field amplitude ratios (γE). The result indicates that there is a broader steerable range of γE to obtain higher ionization enhancement for ω2=3ω1 than that for ω2=2ω1. Through the analysis of trajectories, the recollision picture for ω2=3ω1 is complicated leading to slow change of double ionization, which is benefit to gentle control mechanism. However, the recollision ionization channel is easily distinguishable and sensitive to control double ionization in ω2=2ω1 laser fields and the travel time can be controlled in the order of magnitude of 100 attoseconds.

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