Abstract
Various fundamental properties of the CO 2 gas-dynamic laser are investigated in detail by means of a conventional shock tube with 70 mm inner diameter and nearly 9 m in length. The effect of the catalyzergas composition on the output power is studied, and the optimum content of helium gas is found to be about 70∼80% and that of water vapor is about 2%. The dependence on the stagnation temperature ( T st ) and pressure ( P st ) is also examined. The optimum value of T st for the mixture of 0.2 CO 2 +0.8 N 2 and for 0.1 CO 2 +0.2 N 2 +0.7 He is about 2400 K and 1700 K, respectively. The output power increases with increasing P st , and tends to saturate at the P st -value of 4 to 6 atmospheric pressure. The optimum distance from the nozzle throat is 9±2 cm. The maximum value of the peak output power is nearly 20 W and the power density is about 3 W/cm 3 .
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