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Hybrid RF/DC plasma torch for generation of singlet oxygen in discharge oxygen-iodine laser
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Paper Abstract

Latest advances in development of a hybrid RF/DC plasma jet generator of O2(1Δ) for a discharge oxygen-iodine laser are presented. This novel apparatus is based on a fast mixing of hybrid Ar+He plasma jet of DC electric arc sustained by an RF discharge with an injected neutral O2+He+NO stream. Calculations of singlet oxygen yield have shown that only non-equilibrium plasma with a high content of heated electrons (~3 eV) and a gas temperature of ~2500 K appears to be promising for an achievable yield of singlet oxygen up to ~42 %. A stable high-pressure hybrid RF/DC plasmatron with a diffusive arc mode near the anode side (assisted by a plasma anode) was demonstrated experimentally in the mixture Ar:He = ~9.84:5 mmol/s at a power level of 610 W (RF power 490 W and DC arc power 120 W) and at a pressure of 165 Torr. The specific energy of the plasma jet was 41 J/mmol. A generation of singlet oxygen was performed by a laterally symmetric injection of neutral mixture O2:He:NO = 1.5:2.44:0.22 mmol/s into the plasma jet of the hybrid RF/DC plasmatron. The estimated yield of singlet oxygen O2(1Δ) was ~5 % at a pressure of 10.5 Torr.

Paper Details

Date Published: 15 November 2010
PDF: 9 pages
Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 77510G (15 November 2010); doi: 10.1117/12.880937
Show Author Affiliations
Josef Schmiedberger, Institute of Physics (Czech Republic)
Karel Rohlena, Institute of Physics (Czech Republic)
Jan Gregor, Institute of Plasma Physics (Czech Republic)
Petr Křenek, Institute of Plasma Physics (Czech Republic)
Vít Jirásek, Institute of Physics (Czech Republic)
Miroslav Čenský, Institute of Physics (Czech Republic)
Jarmila Kodymová, Institute of Physics (Czech Republic)

Published in SPIE Proceedings Vol. 7751:
XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Tanja Dreischuh; Petar A. Atanasov; Nikola V. Sabotinov, Editor(s)

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