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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 15 — Jul. 18, 2011
  • pp: 14067–14075

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, and Y.F. Lu  »View Author Affiliations

Optics Express, Vol. 19, Issue 15, pp. 14067-14075 (2011)

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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.

© 2011 OSA

OCIS Codes
(350.5400) Other areas of optics : Plasmas
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown

ToC Category:

Original Manuscript: June 3, 2011
Revised Manuscript: June 25, 2011
Manuscript Accepted: June 27, 2011
Published: July 7, 2011

L.B. Guo, W. Hu, B.Y. Zhang, X.N. He, C.M. Li, Y.S. Zhou, Z.X. Cai, X.Y. Zeng, and Y.F. Lu, "Enhancement of optical emission from laser-induced plasmas by combined spatial and magnetic confinement," Opt. Express 19, 14067-14075 (2011)

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