This paper deals with numerical analyses of the flows in a bow shock wave (B.S.W.)-nozzle system which is applied to the gasdynamic laser (G.D.L.). In the B.S.W.-nozzle system, the dissociation of CO
2 or N
2 molecules of the gas is suppressed even if the gas after the B.S.W. is heated up to 2, 000-5, 000K, since the gas is cooled rapidly expanding through the nozzle.
Numerical calculations for such flow fields lead us to the estimation of the capability and the optimum conditions of such G.D. Ls. It is turned out in our system that the mole-fractions of CO
2can be elevated to 20%, and the small signalgain coefficients increase more than four or five times (3.8m
-1) than those of conventional G.D. Ls.
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