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High-ellipticity resonant below-threshold harmonic generation by a helium atom driven by a moderately intense elliptically polarized laser field.

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Title: High-ellipticity resonant below-threshold harmonic generation by a helium atom driven by a moderately intense elliptically polarized laser field.
Authors: Emelin, M. Yu.1 (AUTHOR) emelinm@mail.ru, Ryabikin, M. Yu.1,2 (AUTHOR)
Source: Optical & Quantum Electronics. Aug2025, Vol. 57 Issue 8, p1-16. 16p.
Subjects: Harmonic generation, Multiphoton ionization, Laser spectroscopy, Quantum transitions, Helium atom, Quantum mechanics, Lasers
Abstract: The below-threshold harmonic generation in the multiphoton ionization regime for a helium atom driven by the elliptically polarized laser field is studied numerically within the framework of two-dimensional (2D) and three-dimensional (3D) models. It is shown that, regardless of the specific type of atomic potential and the model dimensionality, there is a set of laser frequencies, at which the harmonic generation efficiency increases dramatically with a simultaneous increase of their ellipticity. In these cases, the harmonic ellipticity can exceed the laser ellipticity by 2 or more times in absolute value. It is shown that the efficiency of harmonic generation in this interaction regime depends weakly or almost does not depend on the laser ellipticity. The pathways leading to resonant emission of intense harmonics with increased ellipticities are identified. The enhancement of the ellipticity of these harmonics is explained in terms of relative probabilities of resonant transitions in an elliptically polarized laser field for different values of the magnetic quantum number. [ABSTRACT FROM AUTHOR]
Copyright of Optical & Quantum Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="DE" term="%22Harmonic+generation%22">Harmonic generation</searchLink><br /><searchLink fieldCode="DE" term="%22Multiphoton+ionization%22">Multiphoton ionization</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+spectroscopy%22">Laser spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+transitions%22">Quantum transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Helium+atom%22">Helium atom</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+mechanics%22">Quantum mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Lasers%22">Lasers</searchLink>
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  Data: The below-threshold harmonic generation in the multiphoton ionization regime for a helium atom driven by the elliptically polarized laser field is studied numerically within the framework of two-dimensional (2D) and three-dimensional (3D) models. It is shown that, regardless of the specific type of atomic potential and the model dimensionality, there is a set of laser frequencies, at which the harmonic generation efficiency increases dramatically with a simultaneous increase of their ellipticity. In these cases, the harmonic ellipticity can exceed the laser ellipticity by 2 or more times in absolute value. It is shown that the efficiency of harmonic generation in this interaction regime depends weakly or almost does not depend on the laser ellipticity. The pathways leading to resonant emission of intense harmonics with increased ellipticities are identified. The enhancement of the ellipticity of these harmonics is explained in terms of relative probabilities of resonant transitions in an elliptically polarized laser field for different values of the magnetic quantum number. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Optical & Quantum Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11082-025-08355-1
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      – Code: eng
        Text: English
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        PageCount: 16
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      – SubjectFull: Harmonic generation
        Type: general
      – SubjectFull: Multiphoton ionization
        Type: general
      – SubjectFull: Laser spectroscopy
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      – SubjectFull: Quantum transitions
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      – SubjectFull: Helium atom
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      – SubjectFull: Quantum mechanics
        Type: general
      – SubjectFull: Lasers
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              Text: Aug2025
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