Electron Dynamics and Correlations During High-Order Harmonic Generation in Be
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Updated: Oct 3, 2025

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
Published on: July 12, 2017
Eric Kutscher1, Anton N Artemyev1, Philipp V Demekhin1
1Institut für Physik und CINSaT, Universität Kassel, Kassel, Germany.
Abstract:
We investigate theoretically the high-order harmonic generation in beryllium atom irradiated by a short 1850 nm linearly polarized laser pulse in the intermediate strong-field ionization regime with the Keldysh parameter of 0.85. To this end, the respective time-dependent Schrödinger equation is solved by the time-dependent restricted-active-space configuration-interaction (TD-RASCI) method. By systematically increasing the active space of included configurations, we demonstrate an individual effect of different physical processes evoked by the pulse, which, all together, significantly enrich and extend the computed high-order harmonic generation spectrum.
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