Gain Measurements at 10.6 μm in Pure CO2 Discharges

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Abstract
A two beam null method has been used to measure gain at 10.6 μ in a pure CO2 discharge for several gas pressures, flow velocities, and discharge currents. It is shown that the presence of CO, produced by dissociation of CO2, leads to the dominant population inversion mechanisms. Carbon monoxide is found to enhance the gain both by increasing the population of the upper level and by aiding in the depletion of the lower level population.Highest gain values were found for gas pressures of about 1 Torr and current values of the order of 10 mA. The maximum gain obtained was 40% per meter in a sealed system.

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