New kinetic model for assessing the performance of advanced CO sub(2) gasdynamic lasers

A theoretical analysis of CO sub(2) gasdynamic laser (CO sub(2)-GDL) performance using a six-temperature model is described in this paper. This model has specifically included vibrational transfer processes associated with vibrational non equilibrium of O sub(2) and H sub(2)O so that the kinetic beh...

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Bibliographic Details
Published in:JPN J APPL PHYS PART 1 REGUL PAP SHORT NOTE REV PAP 1994-01, Vol.33 (3A), p.1340-1345
Main Authors: Ebina, Kosuke, Yokozawa, Takeshi, Yamaguchi, Shigeru, Kanazawa, Hirotaka, Hara, Hiroshi, Mine, Yasuharu, Komatsu, Katsuhiko, Saito, Hideaki
Format: Article
Language:English
Subjects:
Carbon dioxide lasers
Composition effects
Computer simulation
Kinetic theory of gases
Mathematical models
Oxygen
Thermal effects
Water
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Summary:A theoretical analysis of CO sub(2) gasdynamic laser (CO sub(2)-GDL) performance using a six-temperature model is described in this paper. This model has specifically included vibrational transfer processes associated with vibrational non equilibrium of O sub(2) and H sub(2)O so that the kinetic behaviors of these species in an active laser medium can be properly assessed. The calculation carried out with this model showed that presence of O sub(2) in the laser medium together with H sub(2)O reduces the population inversion. Consequently, under the condition where the concentration of H sub(2)O was approximately 4 mol%, every additional percent of O sub(2) was found to be about one percent reduction in the small signal gain of a CO sub(2)-GDL. The calculation resulted in good agreement with experimental studies in the variation of the small signal gains as well as vibrational temperatures for various laser gas composition.
ISSN:0021-4922