Abstract
In the CO2 gasdynamic laser (GDL), the mirrors, which make up the laser resonator, are usually set in the recesses of a duct to prevent damage or contamination of the mirrors. Consequently, a cavity is formed in the duct, and the gas flow is disturbed by the cavity. In this paper, two-dimensional numerical analysis which considered the cavity in the duct was carried out. From the numerical results and experimental data, the influence of the cavity on the small-signal gain was discussed. According to the numerical results, the small-signal gain decreases in the case which considered the cavity in the duct. This tendency was in good agreement with the experimental ones.
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