Xiaoshi Zhang et al 2008 New J. Phys. 10 025021 doi:10.1088/1367-2630/10/2/025021
Quantum-path control in high-order harmonic generation at high photon energies
Focus on Attosecond PhysicsXiaoshi Zhang1, Amy L Lytle, Oren Cohen, Margaret M Murnane and Henry C Kapteyn
Show affiliationsPart of Focus on Attosecond Physics
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.
- PACS
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42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
- Subjects
- Dates
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Issue 2 (February 2008)
Received 3 October 2007
Published 29 February 2008
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Quantum-path control in high-order harmonic generation at high photon energies
Xiaoshi Zhang et al 2008 New J. Phys. 10 025021
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