Isolated attosecond pulse emission in the plateau region of high-order harmonics drivenby a 7-fs 800-nm laser field

摘要

We investigate theoretically the high-order harmonic generation in the argon gas cell driven with a 7-fs800-nm intense laser pulse, by taking into account the phase-matching effect during the propagation process inthe gas cell. We demonstrate a successful selection of single quantum path of the returning electrons andtherefore the generation of an isolated xuv attosecond pulse in the plateau region of high-order harmonicspectrum, instead of the emission in the form of pulse trains if without optimizing the phase-matching process.