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Multiphoton absorption with Laguerre-Gaussian beams.

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Title: Multiphoton absorption with Laguerre-Gaussian beams.
Authors: Kessi, Ferhat1 (AUTHOR) ferhat.kessi@univ-bejaia.dz
Source: Applied Physics B: Lasers & Optics. Sep2024, Vol. 130 Issue 9, p1-10. 10p.
Subjects: Laguerre-Gaussian beams, Multiphoton absorption, Helical structure, Optical control, Computer simulation
Abstract: Laguerre-Gaussian beams possess a unique transverse mode structure defined by the orbital l and radial m mode numbers, offering promising potential for controlling nonlinear optical interactions. This comprehensive study aims to elucidate the crucial influence of this transverse mode structure on the nonlinear absorption processes. We first established a rigorous theoretical framework by deriving analytical expressions describing the behavior of the Open Z-scan normalized optical transmittance for an arbitrary nth-order nonlinear process under the weak nonlinearity approximation, accounting for the transmitted optical intensity, power, and their dependency on the beam's transverse mode profile. In the numerical simulations, we focused on the specific case of second-order ( n = 2 ) nonlinear absorption. Subsequently, detailed numerical simulations were employed to systematically analyze the intricate interplay between the l and m mode indices and their impact on the transmittance characteristics. By precisely varying these indices, we investigated how the observed transmission profiles were affected, revealing distinct behaviors for different Laguerre-Gaussian modes. When only m increases, absorption decreases due to the wider transverse energy spread, while varying l leads to a non-monotonic trend involving intense lobes. Remarkably, simultaneously increasing both l and m systematically enhances absorption through constructive interference of the helical and ring-like structures. [ABSTRACT FROM AUTHOR]
Copyright of Applied Physics B: Lasers & Optics 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: Multiphoton absorption with Laguerre-Gaussian beams.
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  Data: <searchLink fieldCode="AR" term="%22Kessi%2C+Ferhat%22">Kessi, Ferhat</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ferhat.kessi@univ-bejaia.dz</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Physics+B%3A+Lasers+%26+Optics%22">Applied Physics B: Lasers & Optics</searchLink>. Sep2024, Vol. 130 Issue 9, p1-10. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Laguerre-Gaussian+beams%22">Laguerre-Gaussian beams</searchLink><br /><searchLink fieldCode="DE" term="%22Multiphoton+absorption%22">Multiphoton absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Helical+structure%22">Helical structure</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+control%22">Optical control</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Laguerre-Gaussian beams possess a unique transverse mode structure defined by the orbital l and radial m mode numbers, offering promising potential for controlling nonlinear optical interactions. This comprehensive study aims to elucidate the crucial influence of this transverse mode structure on the nonlinear absorption processes. We first established a rigorous theoretical framework by deriving analytical expressions describing the behavior of the Open Z-scan normalized optical transmittance for an arbitrary nth-order nonlinear process under the weak nonlinearity approximation, accounting for the transmitted optical intensity, power, and their dependency on the beam's transverse mode profile. In the numerical simulations, we focused on the specific case of second-order ( n = 2 ) nonlinear absorption. Subsequently, detailed numerical simulations were employed to systematically analyze the intricate interplay between the l and m mode indices and their impact on the transmittance characteristics. By precisely varying these indices, we investigated how the observed transmission profiles were affected, revealing distinct behaviors for different Laguerre-Gaussian modes. When only m increases, absorption decreases due to the wider transverse energy spread, while varying l leads to a non-monotonic trend involving intense lobes. Remarkably, simultaneously increasing both l and m systematically enhances absorption through constructive interference of the helical and ring-like structures. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Physics B: Lasers & Optics 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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      – Type: doi
        Value: 10.1007/s00340-024-08297-8
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      – Code: eng
        Text: English
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        PageCount: 10
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    Subjects:
      – SubjectFull: Laguerre-Gaussian beams
        Type: general
      – SubjectFull: Multiphoton absorption
        Type: general
      – SubjectFull: Helical structure
        Type: general
      – SubjectFull: Optical control
        Type: general
      – SubjectFull: Computer simulation
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      – TitleFull: Multiphoton absorption with Laguerre-Gaussian beams.
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              M: 09
              Text: Sep2024
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              Y: 2024
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