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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/1006

Title: Radial variation of refractive index, plasma frequency and phase velocity in laser induced air plasma
Authors: Mathuthu, M
Raseleka, RM
Forbes, A
West, NA
Keywords: Laser-induced breakdown spectroscopy
Phase velocity
Plasma frequency
Refractive index
Issue Date: Dec-2006
Publisher: IEEE Institute of Electrical and Electronics
Citation: Mathuthu, M, et al. 2006. Radial variation of refractive index, plasma frequency and phase velocity in laser induced air plasma. IEEE Transactions on Plasma Science, Vol. 34(6), pp 2554-2560
Abstract: Laser-induced breakdown spectroscopy (LIBS) is a non-intrusive technique that needs no sample preparation and even recently, quantitative measurements were done without the need for calibration standards. Much research has been done on the laser induced air plasma to study the spatial variation of plasma parameters in the axial direction of the laser beam. In this paper, the authors report investigation on the radial variation of the refractive index, plasma frequency, and phase velocity of a plasma during laser induced breakdown of air. The results show that the radial variations of the plasma frequency and refractive index are caused by the radial electron density gradient of the plasma. The radial variation of the electron density shows a noticeable depletion at the center of the focus which results in plasma phase velocities greater than the speed of light. Further from the plasma core the electron density diminishes to ambient density at the edges of the plasma. The mean full-width at half maximum (FWHM) for these plasma profiles was found to be about 1.2 mm. The results further reveal that the plasma has a concave parabollic electron density and a convex parabollic refractive index profile near the center of the laser axis, i.e., around a diameter of 0.5 mm.
Description: Copyright: 2006 IEEE Institute of Electrical and Electronics
URI: http://hdl.handle.net/10204/1006
ISSN: 0093-3813
Appears in Collections:Laser physics and technology
General science, engineering & technology

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