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Proceedings Paper

Initial development of hybrid plasma jet generator of O2(1Δ) for DOIL
Author(s): Josef Schmiedberger; Karel Rohlena; Petr Filip; Jan Gregor; Milan Hrabovský; Petr Krenek; Vít Jirásek; Jarmila Kodymová
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Paper Abstract

The initial stage in development of hybrid plasma jet generator of singlet oxygen O2(1Δ) for a discharge oxygen-iodine laser (DOIL) is presented. This novel type of generator is based on a fast mixing of hybrid argon plasma jet of DC electric arc and RF discharge with a neutral molecular oxygen stream. Arc plasma jets have a much higher density of electrons than RF plasma jets to compensate the electro-negativity of oxygen and they can be operated at a higher pressure for an efficient supersonic expansion cooling in DOIL. An RF discharge is applied to the DC arc plasma jet at the hollow anode of the plasmatron to switch it from a hot-spot mode to a diffusive mode. That is advantageous with the use of aluminum anode, which has a lower melting point and a significantly lower rate of O2(1Δ) quenching compared to a standard copper anode in a gas plasmatron. An enhanced non-equilibrium in the plasma jet caused by the RF discharge and neutral oxygen injection is desirable for an efficient O2(1Δ) generation. Preliminary calculations on the equilibrium composition of O2-Ar mixture suggest keeping the arc temperature well down to prevent an excessive dissociation of the molecular oxygen.

Paper Details

Date Published: 18 April 2009
PDF: 7 pages
Proc. SPIE 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 71310U (18 April 2009); doi: 10.1117/12.816695
Show Author Affiliations
Josef Schmiedberger, Institute of Physics (Czech Republic)
Karel Rohlena, Institute of Physics (Czech Republic)
Petr Filip, Institute of Plasma Physics (Czech Republic)
Jan Gregor, Institute of Plasma Physics (Czech Republic)
Milan Hrabovský, Institute of Plasma Physics (Czech Republic)
Petr Krenek, Institute of Plasma Physics (Czech Republic)
Vít Jirásek, Institute of Physics (Czech Republic)
Jarmila Kodymová, Institute of Physics (Czech Republic)


Published in SPIE Proceedings Vol. 7131:
XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers

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