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.
Highlights
The generation of high order harmonic by interaction of an intense laser field with an atomic or molecular target has been widely studied due to its fascinating applications of coherent light production in the extreme ultraviolet range [1,2] and the generation of attosecond pulses [3,4,5]
The bright interference pattern induced by the simultaneously phase-matched two trajectories can be observed by placing a near-field on-axis filter
Our results show that the phase-matching properties of the short and long trajectories are modulated effectively by adding a weak harmonic field
Summary
The generation of high order harmonic by interaction of an intense laser field with an atomic or molecular target has been widely studied due to its fascinating applications of coherent light production in the extreme ultraviolet range [1,2] and the generation of attosecond pulses [3,4,5]. Zaır et al experimentally observed an interference pattern using a multi-cycle laser pulse [12], and the interference pattern is originated from quantumpath interferences [13]. In their experiments [12,13,14,15], the analogous phase-matching degrees of the short and long paths are achieved off axis, and the signal of the interference pattern is very weak to observe. How to simultaneously achieve good phase matching of the short and long trajectories on axis is still difficult. The bright interference pattern induced by the simultaneously phase-matched two trajectories can be observed by placing a near-field on-axis filter
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