Enhancement of optical emission was observed by laser-induced plasmas generated in the blue outer envelope of a n eutral oxy-acetylene flame. A KrF Excimer laser with a wavelength of 248 nm and a pulse duration of 23 ns was used to induce the plasmas. Fast imaging and spectra analyses were carried out to investigate plasma evolution and optical emission. The images of plasma evolution show that plasmas in flame have larger size and stronger emission intensity in the initial plasma lifetime. However, the plasma emission intensity also decays faster in flame. Spectra analyses show enhanced optical emission and narrowed line broadening from plasmas in flame. Up to 4 times of optical emission enhancement of the Al I 394.4 nm and down to 60% of its full width at half maximum (FWHM) were achieved. Moreover, the calculated electron temperature and density indicate that higher temperature and lower density plasmas were produced in the flame environment in the early plasma lifetime.
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International Congress on Applications of Lasers & Electro-Optics
October 14–18, 2018
Orlando, FL, USA
ISBN:
978-1-940168-02-9
PROCEEDINGS PAPER
Enhancement of optical emission from laser-induced breakdown spectroscopy by plasmas generated in flame
L. Liu;
L. Liu
Department of Electrical Engineering
, University of Nebraska-Lincoln Lincoln, NE 68588-0511, USA
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X. Huang;
X. Huang
Department of Electrical Engineering
, University of Nebraska-Lincoln Lincoln, NE 68588-0511, USA
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C. F. Zhang;
C. F. Zhang
Department of Electrical Engineering
, University of Nebraska-Lincoln Lincoln, NE 68588-0511, USA
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L. S. Fan;
L. S. Fan
Department of Electrical Engineering
, University of Nebraska-Lincoln Lincoln, NE 68588-0511, USA
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Y. S. Zhou;
Y. S. Zhou
Department of Electrical Engineering
, University of Nebraska-Lincoln Lincoln, NE 68588-0511, USA
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Y. F. Lu
Department of Electrical Engineering
, University of Nebraska-Lincoln Lincoln, NE 68588-0511, USA
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Published Online:
October 01 2014
Citation
L. Liu, X. Huang, C. F. Zhang, L. S. Fan, Y. S. Zhou, Y. F. Lu; October 14–18, 2018. "Enhancement of optical emission from laser-induced breakdown spectroscopy by plasmas generated in flame." Proceedings of the International Congress on Applications of Lasers & Electro-Optics. ICALEO® 2014: 33rd International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Orlando, FL, USA. (pp. pp. 997-1001). ASME. https://doi.org/10.2351/1.5063153
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