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Signal enhancement of laser-induced breakdown spectroscopy on non-flat samples by single beam splitting
Lei, Bingying1,2; Wang, Jing1,2; Li, Jing1,2; Tang, Jie1; Wang, Yishan1,2; Zhao, Wei1,2; Duan, Yixiang1,3
Department瞬态光学技术国家重点实验室
2019-07-22
Source PublicationOPTICS EXPRESS
ISSN1094-4087
Volume27Issue:15Pages:20541-20557
Contribution Rank1
Abstract

A single-beam-splitting approach was employed to enhance the signal intensity of LIBS under the extreme condition of laser beam grazing the surface of non-flat samples. Examining the time-integrated emission spectra shows that I-Split/ I-Single enhancement factors of 2.5 and 3.5 were achieved at the laser energy of 33 mJ for aluminium alloy and brass. respectively. This factor first increases, reaches its maximum at 33 mJ, and drops gradually with the laser energy further increased. The mechanisms behind the enhanced optical emission and the enhancement factor evolution are discussed by using the proposed laser ablation model and laser-supported detonation (LSD) wave model, respectively. Examining the time-resolved emission spectra show that enhancement effect exists across all the plasma expansion process and the split beam mode allows for a longer plasma lifetime. A remarkable feature is that the trailing phenomenon emerging in the single beam mode vanishes due to the interaction between the plasmas generated by the grazing incident and normally incident laser beams in the split beam mode. The underlying cause is probably that the plasma plume produced by the normally incident laser beam prevents the grazing incident laser beam from further propagating and ablating the sample surface below. These findings not only give an insight into the plasma generation and evolution at grazing incidence of laser beam on sample surface but also provide a more reliable method for outdoor LIBS measurement of irregular samples. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

DOI10.1364/OE.27.020541
Indexed BySCI ; EI
Language英语
WOS IDWOS:000476652500037
PublisherOPTICAL SOC AMER
EI Accession Number20193107261607
Citation statistics
Document Type期刊论文
Identifierhttp://ir.opt.ac.cn/handle/181661/31612
Collection瞬态光学技术国家重点实验室
Corresponding AuthorTang, Jie
Affiliation1.Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xinxi Rd 17, Xian 710119, Shaanxi, Peoples R China
2.Univ Chinese Acad Sci, Sch Future Technol, Yuquan Rd 19, Beijing 100049, Peoples R China
3.Sichuan Univ, Coll Life Sci, Res Ctr Analyt Instrumentat, Wangjiang Rd 29, Chengdu 610065, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Lei, Bingying,Wang, Jing,Li, Jing,et al. Signal enhancement of laser-induced breakdown spectroscopy on non-flat samples by single beam splitting[J]. OPTICS EXPRESS,2019,27(15):20541-20557.
APA Lei, Bingying.,Wang, Jing.,Li, Jing.,Tang, Jie.,Wang, Yishan.,...&Duan, Yixiang.(2019).Signal enhancement of laser-induced breakdown spectroscopy on non-flat samples by single beam splitting.OPTICS EXPRESS,27(15),20541-20557.
MLA Lei, Bingying,et al."Signal enhancement of laser-induced breakdown spectroscopy on non-flat samples by single beam splitting".OPTICS EXPRESS 27.15(2019):20541-20557.
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