A complete integration of the one-dimensional (1D) equations of a CW CO2 laser plasma with fast turbulent motion is presented. The electronic excitation rates in CO2-N2-He-CO-O2-Xe gas mixtures have been taken from the solution of the homogeneous, steady state Boltzmann equation. The model predicts the power characteristics of laser operation under various conditions on the basis of technical input data only. It can be used for the optimization of different discharge structures (DC, RF, longitudinal, transversal) as well as for parametric studies of multiple discharge lasers.
The mechanism of plasma resistance increase found in sealed C02-N2 discharges has been analyzed. From the various species occuring in such discharges only oxides of nitrogen seem to be suitable candidates. Indeed the degradation process can be simulated by adding a certain amount of N20. The failure in detection of these contaminants in naturally degraded mixtures suggests the involvement of complex molecular species depending strongly on the discharge conditions.
The correlation between the plasma resistance and the laser output parameters has been invcstigated in pulsed C 0 2 -N2 discharges. The strong increase of the discharge resistance during gas degradation can be explained on the basis of strong attaching gas components. In degraded mixtures a supression of discharge instabilities togcthcr with the restoration of the laser pulse energy is possible by increasing the reduced electric field E / N temporarily.
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