Abstract

Spectral measurements of the Hα Balmer series line and the continuum radiation are applied to draw inferences of electron density, temperature, and the level of self-absorption in laser ablation of a solid ice target in ambient air. Electron densities of 17 to 3.2×1024m3 are determined from absolute calibrated emission coefficients for time delays of 100–650 ns after generation of laser plasma using Q-switched Nd:YAG radiation. The corresponding temperatures of 4.5–0.95 eV were evaluated from the absolute spectral radiance of the continuum at the longer wavelengths. The redshifted, Stark-broadened hydrogen alpha line emerges from the continuum radiation after a time delay of 300 ns. The electron densities inferred from power law formulas agree with the values obtained from the plasma emission coefficients.

© 2015 Optical Society of America

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