Abstract
The dependence of the small-signal gain coefficient of a supersonic flow CO chemical laser on the area ratio of nozzles is measured using a shock tunnel facility. It is shown that the increase of the Mach number of O2 raises the peak of the gain and shifts the location of the peak gain to the upstream direction. On the other hand, the increase of the Mach number of the dissociated products of CS2 decreases the peak gain and shifts the location of the peak gain to the downstream direction. A theoretical model which was developed previously is used to examine this interesting phenomenon and it is shown that the presence of the base relief between a CS2 nozzle and an O2 nozzle has great effects on the mixed stream.
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