This paper describes the fundamental laser characteristics of a cylindrical slab-type CO
2 gas laser using an RF discharge frequency of 13.56 MHz. Discharge uniformity was investigated with an optical fiber probe by regulating the mixing ratio and the gas pressure of a gaseous medium. Results indicated that the optimum input pumping density of the laser medium was -3 W/cm
3 at a pressure of 5.3 kPa with a mixing ratio of CO
2: N
2: He =1: 4: 15. A peak small-signal gain coefficient of 0.5 %/cm was obtained at the 10.6μm P (20) line. Moreover, a detailed small-signal gain analysis on some other P-branches indicated that the rotational temperature was in between 520 K and 560 K.
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