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3 April 2000 Performance characteristics of the microwave-assisted chemical oxygen-iodine laser
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Proceedings Volume 3889, Advanced High-Power Lasers; (2000)
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan
Output power enhancement of Chemical Oxygen-Iodine Laser (COIL) by pre-dissociation of molecular iodine using a microwave discharge was demonstrated. Two types of approach, transonic operation with grid nozzle and supersonic mixing with ramp nozzle array were tested. In the transonic operation case, a gas velocity at the laser cavity was estimated to be 167 m/s, and I2 dissociation rate was found to be 50%. As a result, 9% of output power enhancement with the microwave pre-dissociation was obtained. In the supersonic injection case, we have initially obtained very poor output power. When we changed the gas flow rates, cavity flow returned to subsonic and we have obtained 284 W output power with 16% of chemical efficiency. No output power enhancement with microwave adoption was observed for ramp nozzle array. It was due to the insufficient dissociation of iodine due to the high stagnation pressure of secondary flow.
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Masamori Endo, Daichi Sugimoto, Hideo Okamoto, Shuzaburo Takeda, and Tomoo Fujioka "Performance characteristics of the microwave-assisted chemical oxygen-iodine laser", Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000);

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