A simple model of laser-induced fluorescence under arbitrary optical thickness conditions at the excitation wavelength |
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Authors: | F. Vidal S. Laville C. Goueguel H. Loudyi K. Rifai M. Chaker M. Sabsabi |
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Affiliation: | 1. Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, Que., Canada J3X 1S2;2. National Research Council of Canada—Industrial Materials Institute, 75 Boulevard de Mortagne, Boucherville, Que., Canada J4B 6Y4 |
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Abstract: | A simple model is worked out to investigate laser-induced fluorescence in media of arbitrary optical thicknesses at the excitation wavelength. Close-form expressions are obtained for laser fluence, absorbed energy density and emitted fluorescence signal as a function of optical thickness and incident laser fluence. It is shown that in optically thick media saturation curves are not proportional to density of the species excited by the laser, except at saturation, and that the saturation fluence increases with optical thickness. Experimental saturation curves of lead in laser-produced plasmas of brass are discussed in the light of this model. |
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