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Fluorescence diagnostics for atmospheric-pressure plasmas using semiconductor lasers

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Abstract

Semiconductor laser diagnostics based on laser-induced fluorescence and absorption have been developed to probe the 4s3P1 → 4p3D1 transition (8104 Å) of argon in an atmospheric-pressure plasma produced by an inductively coupled plasma torch. Spatially resolved measurements of electron number density, atomic kinetic temperature, and electron temperature have been inferred from a line-profile analysis of Stark-affected absorption spectra. State parameters determined from simultaneous fluorescence and absorption line-shape and line-shift measurements are mutually consistent and show good agreement in the analytical region of the plasma. The results represent what are to our knowledge the first spectrally resolved fluorescence measurements of argon in an atmospheric-pressure plasma.

© 1992 Optical Society of America

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