High Harmonic Generation via Continuum Wave-Packet Interference
arXiv:1007.1308 · doi:10.1103/PhysRevLett.105.203902
Abstract
High-order harmonic generation (HHG) is investigated theoretically in the over-the-barrier ionization (OBI) regime revealing the strong signature of interference between two separately ionized and separately propagating free wave packets of a single electron. The interference leads to the emission of coherent light at a photon energy corresponding to the kinetic-energy difference of the two recolliding electron quantum paths, thus complementary to the well-known classical three-step picture of HHG. As will be shown by time-frequency analysis of the emitted radiation, the process entirely dominates the coherent HHG emission after the atomic ground state has been depleted by a strong field. Moreover, it can be isolated from the continuum--bound harmonics via phase-matching.
5 pages, 3 figures
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Cited by in corpus (5)
- A new time-frequency method to reveal quantum dynamics of atomic hydrogen in intense laser pulses: Synchrosqueezing Transform
- Attochirp-free High-order Harmonic Generation
- Electron correlation and interference effects in strong-field processes
- Formation of the solid-state high-order harmonic generation plateau through destructive interference
- Classical versus quantum views of intense laser pulse propagation in gases