Controlling continuum wavepacket interference by two-color laser field in over-the-barrier ionization regime |
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Authors: | Sheng-Peng Zhou Yu-Jun Yang Da-Jun Ding |
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Affiliation: | Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China |
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Abstract: | Continuum wavepacket interference is investigated by numerically solving the time-dependent Schröodinger equation for the interaction of hydrogen atoms with laser fields. The obtained wavepacket evolution indicates that, in the over-the-barrier ionization regime (1016 W/cm2), the continuum–continuum (CC) interference of ionizing electrons becomes the main process in highorder harmonics generation (HHG), compared with continuum-bound (CB) transition, as reported by Kohler et al. [Phys. Rev. Lett. 105(20), 203902 (2010)].We propose a two-color laser field scheme for controlling the quantum trajectories of ionizing electrons and for extending the CC harmonic energy. As a result, a high energy platform occurs in the HHG spectrum, which entirely originates from the CC harmonics, with a cutoff adjustable by the relative phase of the two-color fields. This provides further understanding of the dynamic feature of atoms and molecules in super intense laser fields and provides an opportunity to image the atomic or molecular potential. |
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Keywords: | continuum–continuum interference high-order harmonic generation over-the-barrier ionization |
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