Oxygen assisted iodine atoms production in an RF discharge for a cw oxygen-iodine laser

Pavel A. Mikheyev; Andrey V. Demyanov; Nikolay I. Ufimtsev; Igor V. Kochetov; Valeriy N. Azyazov; Anatoly P. Napartovich

doi:10.1117/12.2065315

3 February 2015 Oxygen assisted iodine atoms production in an RF discharge for a cw oxygen-iodine laser

Pavel A. Mikheyev, Andrey V. Demyanov, Nikolay I. Ufimtsev, Igor V. Kochetov, Valeriy N. Azyazov, Anatoly P. Napartovich

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Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92552F (2015) https://doi.org/10.1117/12.2065315
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

Results of experiments and modeling of CH₃I dissociation in a 40 MHz RF discharge in a discharge chamber of original design to produce iodine atoms for cw oxygen-iodine laser are presented. In experiments a substantial increase in CH₃I dissociation efficiency due to addition of oxygen into Ar:CH₃I mixture was observed. Complete CH₃I dissociation in Ar:CH3I:O2 mixture occurred at 200 W discharge power. Fraction of discharge power spent on iodine atoms production was equal to 16% at 0.17 mmol/s CH₃I flow rate. The rate of carbon atoms production as a function of molecular oxygen and water contents in CH₃I:Ar mixtures was studied with the help of numerical modeling. It was found that addition of water vapor resulted in increase while addition of molecular oxygen and HI in decrease of the rate of carbon atoms production. Due to diffusion most of carbon atoms had enough time to deposit on the walls of the discharge chamber. However, contrary to the situation in a DC discharge, in the RF discharge accumulation of carbon on the walls of the discharge chamber did not hamper discharge stability and iodine production, as it was observed in our experiments.

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Pavel A. Mikheyev, Andrey V. Demyanov, Nikolay I. Ufimtsev, Igor V. Kochetov, Valeriy N. Azyazov, and Anatoly P. Napartovich "Oxygen assisted iodine atoms production in an RF discharge for a cw oxygen-iodine laser", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92552F (3 February 2015); https://doi.org/10.1117/12.2065315

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