Measurements of Population Inversion and Gain in Carbon Fiber Plasmas ; Theoretical Calculations of Radiative Cooling
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چکیده
We have observed an axial enhancement of the CVI 182 1 (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 C02 laser was focused onto the end of an axially oriented thick (35-350~) carbon fiber. A maximum gain of k % 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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تاریخ انتشار 2016