Observation of Primary and Secondary Enhancement of Emission Spectra From Spatially Confined Laser-Induced Aluminum Plasmas

Boping Xu; Bingying Lei; Jing Wang; Yinghua Liu; Yufei Xing; Xiaotao Xie; Wenfu Zhang; Jie Tang; Yishan Wang; Wei Zhao; Yixiang Duan

doi:10.1109/JPHOT.2022.3159720

IEEE Photonics Journal (Jan 2022)

Observation of Primary and Secondary Enhancement of Emission Spectra From Spatially Confined Laser-Induced Aluminum Plasmas

Boping Xu,
Bingying Lei,
Jing Wang,
Yinghua Liu,
Yufei Xing,
Xiaotao Xie,
Wenfu Zhang,
Jie Tang,
Yishan Wang,
Wei Zhao,
Yixiang Duan

Affiliations

Boping Xu: ORCiD; State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China
Bingying Lei: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China
Jing Wang: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China
Yinghua Liu: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China
Yufei Xing: School of Physics and Information Technology, Shaanxi Normal University, Xi'an, China
Xiaotao Xie: School of Physics and Information Technology, Shaanxi Normal University, Xi'an, China
Wenfu Zhang: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China
Jie Tang: ORCiD; State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China
Yishan Wang: ORCiD; State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China
Wei Zhao: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China
Yixiang Duan: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Northwest University, Xi'an, China

DOI: https://doi.org/10.1109/JPHOT.2022.3159720
Journal volume & issue: Vol. 14, no. 2
pp. 1 – 8

Abstract

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In this study, four cylindrical cavities with diameters of more than 10 mm are utilized to confine aluminum plasmas to improve the signal intensities of laser-induced breakdown spectroscopy (LIBS). Primary and secondary enhancements of spectra are observed. This phenomenon is attributed to the fact that plasmas are compressed into a smaller core area with denser population of excited atoms by reflected shockwaves more than one time. The delay time for both primary and secondary signal enhancements is postponed with decreasing the laser energy or increasing the cavity diameter. Relative standard deviations (RSDs) of spectra signal in different experimental conditions are discussed to illustrate the uncertainties of measurement. In addition, enhancement factor, signal-to-background ratio (SBR) and signal-to-noise ratio (SNR) are also examined in the two cases. The fast images of plasma plume further prove the enhancements of emission intensity, as well as its RSD.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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