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Nonsequential double ionization (NSDI) of He atoms in a parallel polarized three-color field is investigated with a three-dimensional classical ensemble model. The driving field is composed by 1600 nm and 800 nm laser pulses with equal intensity. A weak 400 nm laser pulse is used as the controlling field. The results indicate that the electron pairs and ions from the first returning recollision (FRR) trajectories, the odd-returning recollision (ORR) trajectories (excluding FRR) and the even-returning recollision (ERR) trajectories are located at different regions separated well each other in the correlated electron momentum distribution and ion momentum distribution. The electron pairs from FRR trajectories mainly distribute around the origin, and those electron pairs from ORR and ERR trajectories respectively cluster in the first quadrant and the third quadrant. With the increase of the phase of the controlling field, the proportion of FRR trajectories in NSDI first increases and then decreases, and the proportions of those trajectories with the returning number more than one first decrease and then increase. It results in that with the increase of the phase of the controlling field, the anticorrelated emissions first increase and then decrease and correspondingly the ion momentum distribution evolves from a double-hump to a triple-hump and then to a double-hump structure. Moreover, NSDI from multiple-returning recollision trajectories mainly proceed by recollision-induced direct ionization (RDI) mechanism, and NSDI from the FRR trajectories mainly occur by recollision-induced excitation with subsequent ionization (RESI) mechanism. Thus the dominant NSDI ionization mechanism can be also controlled by changing the phase of the controlling field.
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Keywords:
- nonsequential double ionization /
- parallel polarized three-color field /
- recollision /
- ultrafast dynamics
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