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Utilization of moderate cylindrical confinement for precision improvement of laser-induced breakdown spectroscopy signal

Zhe Wang, Zongyu Hou, Siu-lung Lui, Dong Jiang, Jianmin Liu, and Zheng Li

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Abstract

Moderate cylindrical cavity was used to regularize the laser-induced plasma for signal strength enhancement and precision improvement in laser-induced breakdown spectroscopy (LIBS). A polytetrafluoroethylene (PTFE) plate of 1.5 mm thickness with diameter of 3 mm was fabricated. It was placed closely on a sample surface and a laser pulse was shot through the center of the hole to the sample. Using coal as samples, it was verified that the configuration both enhanced the spectral line intensity and reduced shot-to-shot fluctuation, showing its great potential in improving the precision of LIBS analysis.

©2012 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 Plasma morphology (a) without and (b) with cavity confinement.

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Fig. 2
Fig. 2 Theoretical intensity distribution of C(I)193.09nm at different plasma conditions. The intensities are normalized by their maximum value.

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Fig. 3
Fig. 3 Schematic of the experimental setup (not to scale) and the PTFE plate with cylindrical cavities.

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Fig. 4
Fig. 4 Spectra showing the C(I) 193.09nm and C(I) 247.856nm lines. Laser energy was (a) 80 mJ and (b) 130 mJ

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Tables (4)

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Table 1 Average Line Intensity of 193 nm (a.u.) under Different Conditions

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Table 2 Plasma Parameters under Different Conditions

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Table 3 Relaxation Time and Diffusion Length under Different Conditions

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Table 4 RSD (%) of the C(I) 193 nm of Each Experiment Setting

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Equations (3)

Equations on this page are rendered with MathJax. Learn more.

I ij I =F n s ( 1 1+R ) g i I exp(− E i I /(kT)) U I (T) A ij I ,
R= n II n I = 2 n e ⋅ U II (T) U I (T) ⋅ (2π m e kT) 1.5 h 3 ⋅ e − E ion −Δ E ion kT .
n e ( cm −3 )=C(T, n e ) (Δ λ 1/2 ) 3/2 .
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