Control the high-order harmonics cutoff through the combination of chirped laser and static electric field

Details Control the high-order harmonics cutoff through the combination of chirped laser and static electric field Control the high-order harmonics cutoff through the combination of chirped laser and static electric field

2008-09-12

arxiv.org/abs/0809.2191v2

Physics

Optics

7 pages 5figures

Scientific paper

The high harmonic generation from atoms in the combination of chirped laser pulse and static field is theoretically investigated. For the first time, we explore a further physical mechanism of the significant extension of high harmonic generation cutoff based on three-step model. It is shown that the cutoff is substantially extended due to the asymmetry of the combined field. If appropriate parameters are chosen, the cutoff of high harmonic generation can reach Ip+42Up. Furthermore, an ultrabroad super-continuum spectrum can be generated. When the phases are properly compensated for, an isolated 9 attosecond pulse can be obtained.

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