Control of Nonsequential Double Ionization Channels via Cross-Linearly-Polarized Two-Color Laser Field

We investigate nonsequential double ionization(NSDI) of Ar in cross-linearly-polarized two-color (CTC) laser fields, consisting of an 800-nm and a 400-nm field using a three-dimensional classical model. As the crossing angle of the CTC field increases, the NSDI yield exhibits a decrease followed by an increase. Back analysis reveals that the exit collision channel dominates at small angles while the recollision ionization channel dominates at large angles, leading to this nonmonotonic yield trend. The photoelectron momentum distributions (PEMDs) also exhibit the characteristic features of the respective channels at different angles. This indicates that by varying the crossing angle of the CTC field, NSDI can predominantly occur in a single ionization channel. Our results providing a new approach for controlling the correlated electron dynamics.