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Nonlinear optical authentication of sesame oil using spatial self-phase modulation.

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Τίτλος: Nonlinear optical authentication of sesame oil using spatial self-phase modulation.
Συγγραφείς: Gokul, Vijayakumar1,2 (AUTHOR), Puthuparambil, Anju A.1 (AUTHOR), Avinash, Venugopalan Nair A.1 (AUTHOR), Swapna, Mohanachandran Nair S.1 (AUTHOR), Sankararaman, Sankaranarayana I.1 (AUTHOR) drssraman.opto@gmail.com
Πηγή: Journal of Modern Optics. Sep2026, Vol. 73 Issue 16, p1315-1324. 10p.
Θεματικοί όροι: Self-phase modulation, Sesame oil, Nonlinear optics, Adulterations, Temperature effect, Refractive index, Food testing, Optical spectroscopy
Περίληψη: The nonlinear optical (NLO) response of commercially available pure-grade sesame oil (SO) and its adulterated versions is investigated by spatial self-phase modulation (SSPM) technique using a Q-switched pulsed Nd: YAG laser at 532 nm. The NL refractive index ( $ {n_2}) $ n 2) of the samples is determined from the SSPM diffraction patterns and the linear refractive index (RI) using the Abbe refractometer. The decrease in $ {n_2} $ n 2 with increasing laser power reveals that the NLO response is primarily dominated by thermally induced RI effects. The SSPM measurements of SO samples adulterated with various edible oils are carried out at 700 mW. The $ {n_2} $ n 2 and number of diffraction rings decrease systematically with increasing adulterant concentration. The reduction in $ {n_2} $ n 2 is attributed to the dilution of the absorbing species in SO, leading to diminished photo absorption and a weaker thermally induced $ {n_2} $ n 2 variations. The study unveils SSPM as a surrogate non-destructive optical approach for monitoring adulteration. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Modern Optics is the property of Taylor & Francis Ltd 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: Nonlinear optical authentication of sesame oil using spatial self-phase modulation.
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  Data: <searchLink fieldCode="AR" term="%22Gokul%2C+Vijayakumar%22">Gokul, Vijayakumar</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Puthuparambil%2C+Anju+A%2E%22">Puthuparambil, Anju A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Avinash%2C+Venugopalan+Nair+A%2E%22">Avinash, Venugopalan Nair A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Swapna%2C+Mohanachandran+Nair+S%2E%22">Swapna, Mohanachandran Nair S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sankararaman%2C+Sankaranarayana+I%2E%22">Sankararaman, Sankaranarayana I.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> drssraman.opto@gmail.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Modern+Optics%22">Journal of Modern Optics</searchLink>. Sep2026, Vol. 73 Issue 16, p1315-1324. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Self-phase+modulation%22">Self-phase modulation</searchLink><br /><searchLink fieldCode="DE" term="%22Sesame+oil%22">Sesame oil</searchLink><br /><searchLink fieldCode="DE" term="%22Nonlinear+optics%22">Nonlinear optics</searchLink><br /><searchLink fieldCode="DE" term="%22Adulterations%22">Adulterations</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Refractive+index%22">Refractive index</searchLink><br /><searchLink fieldCode="DE" term="%22Food+testing%22">Food testing</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+spectroscopy%22">Optical spectroscopy</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The nonlinear optical (NLO) response of commercially available pure-grade sesame oil (SO) and its adulterated versions is investigated by spatial self-phase modulation (SSPM) technique using a Q-switched pulsed Nd: YAG laser at 532 nm. The NL refractive index ( $ {n_2}) $ n 2) of the samples is determined from the SSPM diffraction patterns and the linear refractive index (RI) using the Abbe refractometer. The decrease in $ {n_2} $ n 2 with increasing laser power reveals that the NLO response is primarily dominated by thermally induced RI effects. The SSPM measurements of SO samples adulterated with various edible oils are carried out at 700 mW. The $ {n_2} $ n 2 and number of diffraction rings decrease systematically with increasing adulterant concentration. The reduction in $ {n_2} $ n 2 is attributed to the dilution of the absorbing species in SO, leading to diminished photo absorption and a weaker thermally induced $ {n_2} $ n 2 variations. The study unveils SSPM as a surrogate non-destructive optical approach for monitoring adulteration. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Modern Optics is the property of Taylor & Francis Ltd 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1080/09500340.2026.2707133
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 10
        StartPage: 1315
    Subjects:
      – SubjectFull: Self-phase modulation
        Type: general
      – SubjectFull: Sesame oil
        Type: general
      – SubjectFull: Nonlinear optics
        Type: general
      – SubjectFull: Adulterations
        Type: general
      – SubjectFull: Temperature effect
        Type: general
      – SubjectFull: Refractive index
        Type: general
      – SubjectFull: Food testing
        Type: general
      – SubjectFull: Optical spectroscopy
        Type: general
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      – TitleFull: Nonlinear optical authentication of sesame oil using spatial self-phase modulation.
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            NameFull: Gokul, Vijayakumar
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            NameFull: Puthuparambil, Anju A.
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            NameFull: Avinash, Venugopalan Nair A.
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            NameFull: Swapna, Mohanachandran Nair S.
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              M: 09
              Text: Sep2026
              Type: published
              Y: 2026
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