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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Bibliographic Details
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.
Format: Article
Language:English
Subjects:
Attosecond pulses
Carrier frequencies
Infrared lasers
Perturbation theory
Polarization
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.460076