Burning voltage of self-sustained volume discharge in CO2 laser irradiated SF6 and mixtures of SF6 with C2H6

A. A. Belevtsev; K. N. Firsov; S. Yu. Kazantsev; I. G. Kononov

doi:10.1117/12.660067

9 June 2006 Burning voltage of self-sustained volume discharge in CO₂ laser irradiated SF₆ and mixtures of SF₆ with C₂H₆

A. A. Belevtsev, K. N. Firsov, S. Yu. Kazantsev, I. G. Kononov

Author Affiliations +

Proceedings Volume 6053, International Conference on Lasers, Applications, and Technologies 2005: High-Power Lasers and Applications; 60530E (2006) https://doi.org/10.1117/12.660067
Event: International Conference on Lasers, Applications, and Technologies 2005, 2005, St. Petersburg, Russian Federation

Abstract

The burning voltages of a self-sustained volume discharge (SSVD) in SF₆ and SF₆-C₂H₆ mixtures subjected to a 10.6 μm pulse CO₂ laser irradiation are measured on varying the laser fluences and delays between the laser and voltage applications over a wide range. These voltages are found to considerably increase as the specific absorbed laser radiation energy increases. The observed effect is treated in terms of enhanced electron attachment due to the capturing of electrons by vibrationally excited molecules of SF₆. Also given are the results of measuring the burning voltages in a non-irradiated confined SSVD in the same mixtures versus the specific electric energy deposited. Most plausible scenarios of vibrational relaxation in SF6 are qualitatively discussed and, on this basis, some inferences about the peculiarities of electron attachment to vibrationally excited molecules of SF₆ are drawn. At lowest values of the specific absorbed laser radiation energy, realized in the present experiments, no significant impact on the discharge voltage was observed. Together with data on the burning voltages in a non-irradiated SSVD this fact has allowed some conclusions about the role of electron attachment to the discharge-produced vibrationally excited molecules of SF₆. In particular the results obtained appear to give no evidence for the electron impact vibrational excitation of SF₆ is capable of considerably affecting the operating characteristics of current electric discharge non-chain chemical HF lasers using SF₆ and SF₆-based mixtures.

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A. A. Belevtsev, K. N. Firsov, S. Yu. Kazantsev, and I. G. Kononov "Burning voltage of self-sustained volume discharge in CO₂ laser irradiated SF₆ and mixtures of SF₆ with C₂H₆", Proc. SPIE 6053, International Conference on Lasers, Applications, and Technologies 2005: High-Power Lasers and Applications, 60530E (9 June 2006); https://doi.org/10.1117/12.660067

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KEYWORDS

Combustion

Molecules

Laser energy

Carbon dioxide lasers

Molecular lasers

Laser applications

Pulsed laser operation

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