Initial development of hybrid plasma jet generator of O2(1&#916;) for DOIL

Josef Schmiedberger; Karel Rohlena; Petr Filip; Jan Gregor; Milan Hrabovský; Petr Krenek; Vít Jirásek; Jarmila Kodymová

doi:10.1117/12.816695

17 April 2009 Initial development of hybrid plasma jet generator of O₂(¹Δ) for DOIL

Josef Schmiedberger, Karel Rohlena, Petr Filip, Jan Gregor, Milan Hrabovský, Petr Krenek, Vít Jirásek, Jarmila Kodymová

Proceedings Volume 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 71310U (2009) https://doi.org/10.1117/12.816695
Event: XVII International Symposium on Gas Flow and Chemical Lasers and High Power Lasers, 2008, Lisboa, Portugal

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.

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Josef Schmiedberger, Karel Rohlena, Petr Filip, Jan Gregor, Milan Hrabovský, Petr Krenek, Vít Jirásek, and Jarmila Kodymová "Initial development of hybrid plasma jet generator of O₂(¹Δ) for DOIL", Proc. SPIE 7131, XVII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 71310U (17 April 2009); https://doi.org/10.1117/12.816695

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