The study of singlet oxygen (1O2) emission showed that the 1O2 could be efficiently produced in the reaction of solid potassium superoxide (KO2) particles with chlorine gas (Cl2), which only occurred on the surface of solid KO2 particles. The liquid water may accelerate the reaction of Cl2 with KO2 and make a complete conversion of KO2 to 1O2. The KO2 had a similar efficiency for 1O2 production as the alkali metal peroxides (such as Li2O2 and Na2O2) as reacting with Cl2.
We report the experimental results of an unstable ring resonator with 90-deg beam rotation for a kilowatt class chemical oxygen iodine laser (COIL). The distributions of near-field phase and far-field intensity were measured. A beam quality of 1.6 was achieved when the COIL average output power was approximately 5 kW.
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