Achievement of positive gain in the amine-based all gas-phase iodine laser system

Taizo Masuda; Tomonari Nakamura; Masamori Endo; Taro Uchiyama

doi:10.1117/12.816679

17 April 2009 Achievement of positive gain in the amine-based all gas-phase iodine laser system

Taizo Masuda, Tomonari Nakamura, Masamori Endo, Taro Uchiyama

Proceedings Volume 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 713108 (2009) https://doi.org/10.1117/12.816679
Event: XVII International Symposium on Gas Flow and Chemical Lasers and High Power Lasers, 2008, Lisboa, Portugal

Abstract

Numerical simulation and flow-tube experiments are conducted to understand the chemistry of an amine-based all gasphase iodine laser (AGIL). The numerical simulation code developed is a one-dimensional, multiple-leaky-stream-tubes kinetics code combined with all the known rate equations to date. Using this code, we find that the key reactions to achieve positive gain are the deactivation reaction of excited iodine atoms by chlorine atoms and the self annihilation reactions of NCl(¹Δ). The order of the injection nozzles is crucial to suppress these reactions. Flow reactor experiments are conducted based on these calculations, and small signal gain is measured. When NCl₃ is not supplied, absorption of the I(²P_1/2)-I(²P_3/2) transition is observed. When NCl₃ is supplied, the absorption is decreased and the dip occasionally turns to the hump, corresponding to a small signal gain of 5×10^-3 %/cm. To our knowledge, this is the first observation of positive small signal gain of the amine-based AGIL system.

Citation Download Citation

Taizo Masuda, Tomonari Nakamura, Masamori Endo, and Taro Uchiyama "Achievement of positive gain in the amine-based all gas-phase iodine laser system", Proc. SPIE 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 713108 (17 April 2009); https://doi.org/10.1117/12.816679

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