UDC 533.9.082.5
Increasing the sensitivity of spectrochemical analysis methods for substances remains a relevant task. This article presents the results of a study on improving the sensitivity of the fs-LIBS method through a combined approach of selective and non-selective enhancement of plasma emission intensity using a KTP crystal. The change in the intensity of the atomic oxygen (O) line at a wavelength of 394.7 nm, generated in the plasma of the filamentation region of femtosecond laser radiation on sand particles (SiO₂), was investigated via the phenomenon of stimulated emission at the second harmonic wavelength under phase mismatch conditions in a KTP crystal. The results showed that the combined use of pump radiation polarization control and the stimulated emission phenomenon via a KTP crystal within a pump-probe scheme simultaneously fragments complex molecules and increases the fluorescence intensity by up to 8 times compared to the single-pulse mode.
femtosecond, libs, aerosol, KTP
1. Babushkin P. A. Neselektivnoe uvelichenie intensivnosti emissii veschestva v metode fs-libs putem upravleniya fazovoy zaderzhkoy mezhdu o i e puchkami // Trudy XHHI Mezhdunarodnogo simpoziuma "Optika atmosfery i okeana. Fizika atmosfery". 08-11 iyulya 2025 goda, g. Tomsk. DOIhttps://doi.org/10.56820/conferencearticle_685be4666f0454.64493492.
2. Hahn D.W., Omenetto N. Laser-induced breakdown spectroscopy (LIBS), part II: review of instrumental and methodological approaches to material analysis and applications to different fields // Applied spectroscopy. 2012. V. 66. N. 4. pp. 347-419.
3. Mendonça C.R., Misoguti L., Zilio S.C. Second harmonic pulse distortion by imperfect phase by imperfect phase matching // Optics communications. 2000. V. 174. N. 5-6. pp. 481-486.
