Open AccessDevelopment and performance evaluation of self-absorption-free laser-induced breakdown spectroscopy for directly capturing optically thin spectral line and realizing accurate chemical composition measurements
Author(s) -
Jiajia Hou,
Lei Zhang,
Wangbao Yin,
Shunchun Yao,
Yang Zhao,
Weiguang Ma,
Lei Dong,
Xiao Liu,
Suotang Jia
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.023024
Subject(s) - laser induced breakdown spectroscopy , materials science , optics , spectroscopy , absorption (acoustics) , laser , absorption spectroscopy , spectral line , line (geometry) , analytical chemistry (journal) , chemistry , physics , geometry , mathematics , chromatography , quantum mechanics , astronomy
A novel self-absorption-free laser-induced breakdown spectroscopy (SAF-LIBS) technique is proposed to directly capture the optically thin spectral line by matching the measured doublet atomic lines intensity ratios with the theoretical one. To realize the experimental SAF-LIBS, the integration time, the fiber collection angle, and the delay time are optimized. The optically thin conditions are validated by comparing the linearity of Boltzmann plots with the traditional self-absorption (SA) correction method and evaluating the SA coefficients. The applicability and limitation of SAF-LIBS on element concentration and laser energy are also discussed. Univariate quantitative analysis results show that, compared with ordinary LIBS, the average absolute error of aluminum concentration has been reduced by an order of magnitude, which proves that this SAF-LIBS technique is qualified to realize accurate chemical composition measurements.