Contribution of the collective electron dynamics to the polarization response of an atom subjected to intense IR and weak XUV pulses

We analyze the polarization response of a single Ne atom in an intense infrared (IR) laser field and weak extreme ultraviolet (XUV) isolated attosecond pulse (IAP). The analysis is based on the numerical solution of the time-dependent Kohn–Sham equations and the recently developed perturbation theor...

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Published in:Optics letters 2022-07, Vol.47 (13), p.3147-3150
Main Authors: Romanov, A. A., Silaev, A. A., Vvedenskii, N. V., Flegel, A. V., Frolov, M. V.
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Language:English
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Attosecond pulses
Carrier frequencies
Infrared lasers
Perturbation theory
Polarization
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description We analyze the polarization response of a single Ne atom in an intense infrared (IR) laser field and weak extreme ultraviolet (XUV) isolated attosecond pulse (IAP). The analysis is based on the numerical solution of the time-dependent Kohn–Sham equations and the recently developed perturbation theory in the XUV field for an atom subjected to an intense IR field. In our numerical results, we observe a significant increase in the magnitude of the atomic polarization response at the frequencies near the carrier frequency of the IAP and associate it with XUV-induced collective dynamics contributing to the polarizability of Ne. The specific interference between IR- and XUV-induced channels is discussed, and its utilization for retrieving the phase of the generated harmonics in the IR field is suggested.
doi_str_mv 10.1364/OL.460076
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subjects Attosecond pulses
Carrier frequencies
Infrared lasers
Perturbation theory
Polarization
title Contribution of the collective electron dynamics to the polarization response of an atom subjected to intense IR and weak XUV pulses
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