Phase delay effect of nonsequential double ionization of Ar atoms in a 45° cross-linearly-polarized two-color laser field

We theoretically investigate the nonsequential double ionization (NSDI) of Ar atoms by a three-dimensional (3D) classical ensemble method in a 45 degrees cross-linearly-polarized two-color (CTC) laser field. Our results show that the phase delay of the synthesized two-color laser field can influence the NSDI process. By tracing the classical trajectories of the NSDI process, we find that the single-recollision (SR) and the double-recollision (DR) both occur. Whether the recollision processes happen once or twice, the NSDI predominantly experience the recollision-induced excitation with subsequent ionization (RESI) channel. And the phase delay of the CTC pulse could influence the probability of the double ionization and the energy transfer in NSDI process. This provides a method to obtain the information about the dynamics of the recollision process.