MEASUREMENTS OF POPULATION INVERSION AND GAIN IN CARBON FIBER PLASMAS ; THEORETICAL CALCULATIONS OF RADIATIVE COOLING

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Abstract
We have observed an axial enhancement of the CVI 182 Å (3-2) transition which was correlated with the appearance of a population inversion between levels 3 and 2 in an experiment in which a 0.5kJ CO2 laser was focused onto the end of an axially oriented thick (35-350µ) carbon fiber. A maximum gain of k [MATH] 6 cm-1 was measured for a carbon fiber coated with a thin layer of aluminum (for additional radiation cooling). We also present theoretical calculations of radiative cooling rates of oxygen appropriate for a high density transient plasma together with a more general model useful for picking the optimum coolant ion

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