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Proceedings Paper

Performance characteristics of the microwave-assisted chemical oxygen-iodine laser
Author(s): Masamori Endo; Daichi Sugimoto; Hideo Okamoto; Shuzaburo Takeda; Tomoo Fujioka
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Paper Abstract

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.

Paper Details

Date Published: 3 April 2000
PDF: 9 pages
Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000); doi: 10.1117/12.380921
Show Author Affiliations
Masamori Endo, Tokai Univ. (Japan)
Daichi Sugimoto, Tokai Univ. (Japan)
Hideo Okamoto, Tokai Univ. (Japan)
Shuzaburo Takeda, Tokai Univ. (Japan)
Tomoo Fujioka, Tokai Univ. (Japan)


Published in SPIE Proceedings Vol. 3889:
Advanced High-Power Lasers
Marek Osinski; Howard T. Powell; Koichi Toyoda, Editor(s)

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