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Chinese Optics> 2023> Accepted Manuscript

CHEN Fei, WANG Shu-qing, CHENG Nian-kai, ZHANG Wan-fei, ZHANG Yan, LIANG Jia-hui, ZHANG Lei, WANG Gang, MA Xiao-fei, LIU Zhen-rong, LUO Xue-bin, YE Ze-fu, ZHU Zhu-jun, YIN Wang-bao, XIAO Lian-tuan, JIA Suo-tang. Study and analysis of a miniature self-absorption-free laser-induced breakdown spectroscopy with high-repetition rate acousto-optic gating[J]. Chinese Optics. doi: 10.37188/CO.2023-0147

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Study and analysis of a miniature self-absorption-free laser-induced breakdown spectroscopy with high-repetition rate acousto-optic gating

doi:10.37188/CO.2023-0147

CHEN Fei^{1, 2,},
WANG Shu-qing³,
CHENG Nian-kai⁴,
ZHANG Wan-fei⁵,
ZHANG Yan⁶,
LIANG Jia-hui^{1, 2},
ZHANG Lei^{1, 2,,},
WANG Gang⁵,
MA Xiao-fei⁵,
LIU Zhen-rong⁵,
LUO Xue-bin⁵,
YE Ze-fu⁷,
ZHU Zhu-jun⁷,
YIN Wang-bao^{1, 2,,},
XIAO Lian-tuan^{1, 2},
JIA Suo-tang^{1, 2}

1.
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
2.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
3.
National Energy R & D Center of Petroleum Refining Technology (RIPP, SINOPEC), Beijing 100083, China
4.
China Academy of Ordnance Science, Beijing 100089, China
5.
Shanxi Xinhua Chemical Defense Equipment Research Institute Co., Ltd., Taiyuan 030041, China
6.
School of Optoelectronic Engineering, Xi’an Technological University, Xi’an 710021, China:
7.
Shanxi Gemeng US-China Clean Energy R & D Center Co., Ltd, Taiyuan, 030032, China

Funds:Supported by National Energy R&D Center of Petroleum Refining Technology; National Key R&D Program of China (No. 2017YFA0304203); Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (IRT_17R70); National Natural Science Foundation of China (No. 61975103, No. 61875108, No. 61775125 and No. 11434007); Major Special Science and Technology Projects in Shanxi (No. 201804D131036); 111 Project (No. D18001); Fund for Shanxi ‘1331KSC’.

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Corresponding author:k1226@sxu.edu.cn;ywb65@sxu.edu.cn
Available Online:08 Dec 2023

Abstract

Abstract

To improve the accuracy of elemental quantitative analysis, to eliminate the self-absorption effect in laser-induced breakdown spectroscopy (LIBS), and to meet the requirement of convenient elemental analysis in industry, the device of self-absorption free laser-induced breakdown spectroscopy (SAF-LIBS) technology needs to be miniaturized. This paper presents a novel quantitative analysis technique, the high repetition rate acousto-optic gated SAF-LIBS method. To enhance integral spectral intensity, a high repetition rate laser is used to produce quasi-continuous plasmas. In addition, an AOM (acousto-optic modulator) serves as an as an optical gating switch, enabling the use of a compact charge-coupled device (CCD) spectrometer instead of the intensified charge coupled device (ICCD) and medium step grating spectrometer found in conventional large-scale SAF-LIBS devices. The results in a self-absorption-free system that is less bulky and less expensive. After optimizing the system parameters, the quantitative analysis and prediction of the Al element in the sample was achieved. Experimental results show that plasma characteristics are impacted by the laser repetition rate, which affects the intensity of spectral signal. The doublet intensity of Al I 394.4 nm and Al I 396.15 nm is enhanced and then diminished at a laser repetition rate ranging from 1 kHz to 50 kHz, with the optimal repetition rate identified as being 10 kHz. The doublet line intensity ratios of Al decrease with delay time under different fiber collection angles. The highest signal-to-noise ratio is achieved at an angle of 45°, while the optimal optically thin time t _otis 426 ns at a certain integration time. Al is quantitatively analyzed and predicted at a laser repetition rate of 10 kHz, fiber collection angle of 45°, and delay time of 400 ns. The experimental results show that the calibration curve linearity of R²= 0.982 and an average absolute prediction error of aluminum is reduced from 0.8% of single LIBS to 0.18%, which is equivalent to that of traditional SAF-LIBS. Additionally, the high repetition rate acousto-optic gating SAF-LIBS not only effectively eliminates continuous background radiation and broadens spectral lines in optically thick plasma, but also offers the advantages of miniaturization, low cost, convenience, and reliability. Therefore, this study plays a significant role in advancing SAF-LIBS technology from laboratory testing to industrial applications.
- laser-induced breakdown and spectroscopy,
- self-absorption free,
- optically thin,
- high repetition rate laser,
- acousto-optic gating.

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References (23)

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