Quantum-path control in high-order harmonic generation at high photon energies

Xiaoshi Zhang*, Amy L. Lytle, Oren Cohen, Margaret M. Murnane, Henry C. Kapteyn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We show through experiment and calculations how all-optical quasi-phase-matching of high-order harmonic generation can be used to selectively enhance emission from distinct quantum trajectories at high photon energies. Electrons rescattered in a strong field can traverse short and long quantum trajectories that exhibit differing coherence lengths as a result of variations in intensity of the driving laser along the direction of propagation. By varying the separation of the pulses in a counterpropagating pulse train, we selectively enhance either the long or the short quantum trajectory, and observe distinct spectral signatures in each case. This demonstrates a new type of coupling between the coherence of high-order harmonic beams and the attosecond time-scale quantum dynamics inherent in the process.

Original languageEnglish
Article number025021
JournalNew Journal of Physics
StatePublished - 29 Feb 2008
Externally publishedYes


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