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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2008, Volume12

167 pages

DOI: 10.1615/HighTempMatProc.v12.i1-2

Issue price - $362.00

SELF-ABSORBED LINES ANALYSIS OF A RECOMBINING LASER INDUCED ALUMINUM PLASMA

M. Ribiere
CORIA, UMR 6614, Université de Rouen, Site Universitaire du Madrillet, Avenue de l'Université, 76801 Saint-Étienne du Rouvray Cedex, France

B. G. Cheron
CORIA, UMR 6614, Université de Rouen, Site Universitaire du Madrillet, Avenue de l'Université, 76801 Saint-Étienne du Rouvray Cedex, France

A. Bultel
CORIA, UMR 6614, Université de Rouen, Site Universitaire du Madrillet, Avenue de l'Université, 76801 Saint-Étienne du Rouvray Cedex, France

ABSTRACT

During the recombination of a plasma produced by a nanosecond laser impact on an aluminum alloy target, the resonant spectral lines of Al I exhibit strong deformations owing to the self-absorption. At 1 mm above the surface and for different time delays after the laser pulse, the intensity and the shape of these experimental lines have been successfully compared with the ones derived from the integration of a self-consistent radiative transfer equation (RTE). Without any equilibrium hypothesis, reliable spatio-temporal evolutions of the involved densities (free electron, upper and lower state of the resonant transitions) are thus obtained between 60 and 180 ns after the laser pulse.