Abstract
A detailed experimental investigation of small‐signal gain in a CO gasdynamic laser, produced in a shock tunnel is presented. Gains of the P7(3) transition were measured at a distance 44 cm downstream from the nozzle throat for various CO–Ar and CO–N2–Ar mixtures at stagnation temperatures of 1800°–3800 °K and stagnation pressures of 18–40 atm. Optimum gas temperatures and compositions were observed. Laser oscillations were observed simultaneously in two cavities located at 44 and 56 cm downstream from the nozzle throat. The experimental data on gain have been compared with a numerical model. A quantitatively good argeement between calculations and experiments was found which permits the utilization of the mathematical model for a better understanding of the processes involved in the laser operation. Small signal gains and multi‐line laser power outputs were calculated along the nozzle for various initial conditions. Calculations indicate that maximum gain and maximum power occur for P3(4)‐P5(4) lines at a stagnation temperature of about 3000 °K and a gas composition of CO:Ar = 20:80.
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