High-order harmonic generation at high laser intensities beyond the tunnel regime

We present studies of high-order harmonic generation (HHG) at laser intensities well above saturation. We use driving laser pulses which present a particular electron dynamics in the turn-on stage. Our results predict an increasing on the harmonic yield, after an initial dropping, when the laser int...

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Veröffentlicht in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2014-07, Vol.68 (7), Article 195
Hauptverfasser: Pérez-Hernández, Jose Antonio, Ciappina, Marcelo F., Lewenstein, Maciej, Zaïr, Amelle, Roso, Luis
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Sprache:eng
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Zusammenfassung:We present studies of high-order harmonic generation (HHG) at laser intensities well above saturation. We use driving laser pulses which present a particular electron dynamics in the turn-on stage. Our results predict an increasing on the harmonic yield, after an initial dropping, when the laser intensity is increased. This fact contradicts the general belief of a progressive degradation of the harmonic emission at ultrahigh intensities. We have identified a particular set of trajectories which emerges in the turn-on stage of these singular laser pulses, responsible of the unexpected growth on the harmonic efficiency at this high intensity regime. Our study combines two complementary approaches: classical analysis and full quantum mechanical calculations resulting from the numerical integration of the 3-dimensional time-dependent Schrödinger equation complemented with the time-frequency analysis.
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/e2014-50086-6