Development of TEA CO2 laser device with supersonic flow

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TEA-CO_2 gas laser device using supersonic flow have been studied to increase the laser output. The shock-free supersonic nozzle is successfully developed with precise modification of the flow channel, which results in the stable excitation discharge for lasing. We also investigate the effect of gas temperature fall accompanied by adiabatic expansion on the laser output in the supersonic flow condition at M=2. The small-signal gain is measured at 2.25%/cm for the supersonic flow of the gas at 133K in temperature, which is around 1.4 times as high as that obtained for the still laser medium at the room temperature.