Influence of the polarization of a multielectron atom in a strong laser field on high-order harmonic generation

A. A. Romanov, A. A. Silaev, M. V. Frolov, and N. V. Vvedenskii

Phys. Rev. A 101, 013435 – Published 30 January 2020

Abstract

We study the ionization and high-order harmonic generation (HHG) in argon by short linearly polarized laser pulses. We compare the populations of atomic orbitals and HHG spectra in a wide range of laser-pulse parameters, taking into account the dynamics of all orbitals based on the time-dependent density-functional theory (TDDFT) and only the most active orbital within the single-active electron (SAE) approximation. At high intensities of laser pulses, the atom polarization leads to suppression in the bound-state depletion due to the screening of the external field. The significant increase in the HHG yield is observed for the TDDFT calculations in comparison with the SAE calculations. The contribution of different orbitals in the TDDFT calculations of HHG spectra is discussed.

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Received 21 November 2019

DOI:https://doi.org/10.1103/PhysRevA.101.013435

Physics Subject Headings (PhySH)

Atomic & molecular processes in external fields Density functional theory Strong electromagnetic field effects

Atomic, Molecular & Optical

Authors & Affiliations

A. A. Romanov ^1,2,3, A. A. Silaev ^1,2,3, M. V. Frolov ³, and N. V. Vvedenskii ^1,2,3

¹Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia
²Department of Radiophysics, University of Nizhny Novgorod, Nizhny Novgorod 603950, Russia
³Department of Physics, Voronezh State University, Voronezh 394018, Russia

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Vol. 101, Iss. 1 — January 2020

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