title: Macroscopic control of quantum paths in high order harmonics by a weak second harmonic field.
abstract: The phase matching of quantum paths in high-order harmonic generation is investigated in a two-color laser field. Our results show that the phase-matching properties of the short and long trajectories can be modulated effectively by adding a weak second harmonic field. This scheme can not only achieve the quantum path selection, but more importantly it can achieve on-axis phase matching for both of the two trajectories simultaneously. A bright interference pattern induced by the simultaneously phase-matched two trajectories can be observed by placing a near-field on-axis filter, which has great potential for experimentally characterizing the full single-atom dipole moment.
authors.affiliation: Huazhong University of Science andTechnology, Wuhan, China.
authors.forename: Shaoyi
authors.initials: S
authors.lastname: Wang
authors.forename: Qingbin
authors.initials: Q
authors.lastname: Zhang
authors.forename: Weiyi
authors.initials: W
authors.lastname: Hong
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Zhu
authors.forename: Peixiang
authors.initials: P
authors.lastname: Lu
mesh_terms: D003116:Color; D003198:Computer Simulation; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D011789:Quantum Theory; D012542:Scattering, Radiation