Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement

Zhenhua JIANG (姜振华); Junfeng SHAO (邵俊峰); Tingfeng WANG (王挺峰); Jin GUO (郭劲); Dan ZHANG (张丹); Anmin CHEN (陈安民); Mingxing JIN (金明星)

doi:10.1088/2058-6272/aabc5e

Plasma Science and Technology > 2018 > 20(8): 85503-085503. > DOI: 10.1088/2058-6272/aabc5e

Zhenhua JIANG (姜振华), Junfeng SHAO (邵俊峰), Tingfeng WANG (王挺峰), Jin GUO (郭劲), Dan ZHANG (张丹), Anmin CHEN (陈安民), Mingxing JIN (金明星). Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement[J]. Plasma Science and Technology, 2018, 20(8): 85503-085503. DOI: 10.1088/2058-6272/aabc5e

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Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement

¹ State Key Laboratory of Laser Interaction with Matter & Innovation Laboratory of Electro-Optical Countermeasures Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, People’s Republic of China
² Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, People’s Republic of China
³ Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, People’s Republic of China

Funds: We acknowledge the support by National Natural Science Foundation of China (Grant Nos. 11674128, 11504129, and 11474129); Jilin Province Scientific and Technological Development Program, China (Grant No. 20170101063JC); the Thirteenth Five-Year Scientific and Technological Research Project of the Education Department of Jilin Province, China (2016, No. 400).

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Received Date: January 07, 2018

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Abstract

Abstract

Spatial confinement can significantly enhance the spectral intensity of laser-induced plasma in air. It is attributed to the compression of plasma plume by the reflected shockwave. In addition, optical emission spectroscopy of laser-induced plasma can also be affected by the distance between lens and sample surface. In order to obtain the optimized spectral intensity, the distance must be considered. In this work, spatially confined laser-induced silicon plasma by using a Nd: YAG nanosecond laser at different distances between lens and sample surface was investigated. The laser energies were 12 mJ, 16 mJ, 20 mJ, and 24 mJ. All experiments were carried out in an atmospheric environment. The results indicated that the intensity of Si (I) 390.55 nm line firstly rose and then dropped with the increase of lens-to-sample distance. Moreover, the spectral peak intensity with spatial confinement was higher than that without spatial confinement. The enhancement ratio was approximately 2 when laser energy was 24 mJ.
- laser-induced breakdown spectroscopy,
- LIBS,
- spatial confinement,
- distance of lensto- sample,
- signal enhancement

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References (50)

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