Abstract
The operational characteristics of a continuously tunable DF → CO 2 transfer laser optically pumped with radiation from a pulsed DF laser are experimentally and theoretically studied. The pump radiation is absorbed by DF in a high-pressure DF/CO 2 /He gas mixture, and subsequent V-V energy transfer to the CO 2 ν 3 mode provides the CO 2 laser population inversion. Continuous tuning of the CO 2 laser frequency between five CO 2 line centers from 29.14 to 29.30 THz has been demonstrated, using a 12 atm gas mixture. The maximum pulse energy was about 0.8 mJ. In experiments with a two-mirror CO 2 laser resonator, pulse energies up to 6 mJ and 35 percent slope quantum efficiency have been obtained at 10 atm gas pressure. The gas mixture typically contained 0.5 percent DF, 5 percent CO 2 , and 94.5 percent He, but this was not critical. Computer simulations based on a rate equation model of the laser have given results which are in reasonable agreement with those obtained experimentally.
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