The performance of thermally excited mixing-type N
2/CO
2 gasdynamic lasers (GDLs) is affected by various parameters; the nitrogen stagnation temperature and pressure, mixing methods, the CO
2 flow rate, the foreign gas additions, etc. This paper describes theoretical and experimental studies on the mixing-type N
2/CO
2 GDLs, over a wide range of these parameters. Theoretical prediction, which uses a simplified mixing model and a linear mixing rate is able to give a qualitative explanation of the experimental results. It is found that a cavity mixing is the superior method and that, within the range of 1000K_??_1500K, the gain coefficients and the laser power increase almost linearly with the increase of the reservoir temperature, but the addition of foreign gases (He, Ar) exerts only a minor influence on them.
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