Abstract
Experiments with a CO2 gas-dynamic laser were run in a shock-tube facility. Population inversion of the CO2 molecule was achieved by expansion of heated test gas through a supersonic nozzle. Measurements included shape, time, and energy of the laser output, and beam diameter. Beam divergence and mirror deterioration were reduced by changes in optical cavity geometry. Laser power was optimized for temperature, fraction of He in the test gas, and output-mirror transmissivity. Maximum laser power was 250 W for a 100-cm3 cavity with a 20-cm gain path.
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