Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement

L. B. Guo, W. Hu, B. Y. Zhang, X. N. He, C. M. Li, Y. S. Zhou, Z. X. Cai, X. Y. Zeng, Y. F. Lu

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

To enhance optical emission in laser-induced breakdown spectroscopy, both a pair of permanent magnets and an aluminum hemispherical cavity (diameter: 11.1 mm) were used simultaneously to magnetically and spatially confine plasmas produced by a KrF excimer laser in air from pure metal and alloyed samples. High enhancement factors of about 22 and 24 in the emission intensity of Co and Cr lines were acquired at a laser fluence of 6.2 J/cm2 using the combined confinement, while enhancement factors of only about 11 and 12 were obtained just with a cavity. The mechanism of enhanced optical emission by combined confinement, including shock wave in the presence of a magnetic field, is discussed. The Si plasmas, however, were not influenced by the presence of magnets as Si is hard to ablate and ionize and hence has less free electrons and positive ions. Images of the laser-induced Cr and Si plasmas show the difference between pure metallic and semiconductor materials in the presence of both a cavity and magnets.

Original languageEnglish (US)
Pages (from-to)14067-14075
Number of pages9
JournalOptics Express
Volume19
Issue number15
DOIs
StatePublished - Jul 18 2011

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light emission
cavities
augmentation
magnets
lasers
laser-induced breakdown spectroscopy
positive ions
permanent magnets
excimer lasers
free electrons
shock waves
fluence
aluminum
air
magnetic fields
metals
ions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement. / Guo, L. B.; Hu, W.; Zhang, B. Y.; He, X. N.; Li, C. M.; Zhou, Y. S.; Cai, Z. X.; Zeng, X. Y.; Lu, Y. F.

In: Optics Express, Vol. 19, No. 15, 18.07.2011, p. 14067-14075.

Research output: Contribution to journalArticle

Guo, LB, Hu, W, Zhang, BY, He, XN, Li, CM, Zhou, YS, Cai, ZX, Zeng, XY & Lu, YF 2011, 'Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement', Optics Express, vol. 19, no. 15, pp. 14067-14075. https://doi.org/10.1364/OE.19.014067
Guo, L. B. ; Hu, W. ; Zhang, B. Y. ; He, X. N. ; Li, C. M. ; Zhou, Y. S. ; Cai, Z. X. ; Zeng, X. Y. ; Lu, Y. F. / Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement. In: Optics Express. 2011 ; Vol. 19, No. 15. pp. 14067-14075.
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