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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

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Front. Optoelectron.    2022, Vol. 15 Issue (2) : 17    https://doi.org/10.1007/s12200-022-00020-9
RESEARCH ARTICLE
Spatial confinement effects of laser-induced breakdown spectroscopy at reduced air pressures
Zhongqi Hao1,2,3, Zhiwei Deng1,2, Li Liu1,2(), Jiulin Shi1,2, Xingdao He1,2
1. School of Measuring and Optoelectronic Engineering, Nanchang Hangkong University, Nanchang 330063, China
2. Key Laboratory of Opto-electronic Information Science and Technology of Jiangxi Province, Nanchang Hangkong University, Nanchang 330063, China
3. Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract

Spatial confinement is a simple and cost-effective method for enhancing signal intensity and improving the detection sensitivity of laser-induced breakdown spectroscopy (LIBS). However, the spatial confinement effects of LIBS under different pressures remains a question to be studied, because the pressure of the ambient gas has a significant influence on the temporal and spatial evolution of plasma. In this study, spatial confinement effects of LIBS under a series of reduced air pressures were investigated experimentally, and the plasma characteristics under different air pressures were studied. The results show that the reduced air pressure can lead to both earlier onset and weakening of the enhancement effect of the spatial confinement on the LIBS line intensity. When the air pressure drops to 0.1 kPa, the enhancement effect of the emission intensity no longer comes from the compression of the reflected shock wave on the plasma, but from the cavity’s restriction of the plasma expansion space. In conclusion, the enhancement effect of spatial confinement technology on the LIBS is still effective when the pressure is reduced, which further expands the research and application field of spatial confinement technology.
Keywords Laser-induced breakdown spectroscopy (LIBS)      Spatial confinement      Plasma temperature      Stark broadening     
Corresponding Author(s): Li Liu   
Issue Date: 16 May 2022
 Cite this article:   
Zhongqi Hao,Zhiwei Deng,Li Liu, et al. Spatial confinement effects of laser-induced breakdown spectroscopy at reduced air pressures[J]. Front. Optoelectron., 2022, 15(2): 17.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-022-00020-9
https://academic.hep.com.cn/foe/EN/Y2022/V15/I2/17
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