Academic Journal
Nonlinear optical authentication of sesame oil using spatial self-phase modulation.
| Τίτλος: | Nonlinear optical authentication of sesame oil using spatial self-phase modulation. |
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| 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] |
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