Thermal modification of the kinetic sequence pumping the helium-nitrogen charge-transfer laser

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Abstract
An increased output energy of 5 J/l at 427.8 nm has been obtained with 3.2% efficiency from the helium‐nitrogen charge‐transfer laser through the thermal modification of the kinetic sequence pumping the inversion. A decrease in gas temperature of 40 °C has been sufficient to increase output pulse energies by a factor of 2 for high currents of the electron beam discharge and by as much as a factor of 20 at lower currents. These results have necessitated a revision of the pumping sequence to include charge transfer from the ion aggregate, He+3. The new kinetic model is sufficient to predict the effects of thermal modification, as well as the strong nonlinear dependence of laser output on pressure which had been previously reported. It indicates that the theoretical limit on efficiency 6.10% May mest of 6–10% may best be approached through proper choice of the gas temperature.

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