Abstract
Experimental studies are conducted on a supersonic flow CO chemical laser to obtain data on the reaction zone structure and the small signal gain coefficient when Ar gas is injected onto the reactant interface. The visual observation of the chemical luminescence from various reactions in the laser cavity clearly demonstrates that the gas injection enhances the mixing via the reactant surface stretching. It is also shown that the small signal gain coefficient can be made higher by the gas injection. However, the gain decays in the downstream direction very rapidly due to the temperature rise. The region where the gain is positive can be extended significantly using a divergent channel, although the peak value of the gain is decreased.
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