Abstract
Cooling the flow in the electric discharge excited oxygen–iodine laser is used to increase gain in the supersonic cavity and laser power. The flow is cooled by injecting helium precooled in a liquid nitrogen bath downstream of the iodine injector. The highest gain achieved is 0.21% cm−1 over the gain path of 10 cm. Laser power measured in a stable resonator with 99.9% and 99.0% reflectivity mirrors is 7.8 W. Gain measured downstream of the resonator during lasing remains high, 0.15% cm−1, 25% lower than gain without lasing, demonstrating that a small fraction of power available for lasing is coupled out.
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