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Proceedings Paper

Plasma vs. rf interactions in fast-flow CO2 high-power lasers
Author(s): Tuan M. Le; Heinz Basalka; Markus Bohrer; Dieter Schuoecker
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Paper Abstract

Although the plasma properties of CO2 gas lasers have been extensively investigated there seems to be remaining uncertainties concerning the achievement of an optimized plasma state giving the best possible laser efficiency. Such optimization would be especially for high power lasers where a loss of some percents in efficiency can mean a considerable decrease for the laser output. To investigate the effects of plasma vs. rf interactions in longitudinal fast-flow CO2 lasers a sufficient adequate plasma theory is used, based on the cross-sections of all involved processes. The main interest lies in the determination of all relevant parameters such as the electric field and current density along the electrodes which have pronounced dependencies on gas temperature and pressure. Although these variables change enormously in downstream direction the model reveals plasma coefficients which stay as unchangeable constants. Moreover, as is common for longitudinal fast-flow CO2 lasers the electrodes are slightly inclined to obtain an increased laser performance, independent of the rf matching. By a rather simple consideration of plasma and rf interactions this effect can be basically explained so that an optimization for the best attainable efficiency is possible. The calculations are compared to measurements of different authors and are applied to a 6 kW fast flow coaxial system.

Paper Details

Date Published: 24 June 1998
PDF: 12 pages
Proc. SPIE 3264, High-Power Lasers, (24 June 1998); doi: 10.1117/12.311907
Show Author Affiliations
Tuan M. Le, Wild Emco Lasertec GmbH (Austria)
Heinz Basalka, Wild Emco Lasertec GmbH (Austria)
Markus Bohrer, Wild Emco Lasertec GmbH (Austria)
Dieter Schuoecker, Technical Univ. of Vienna (Austria)

Published in SPIE Proceedings Vol. 3264:
High-Power Lasers
Santanu Basu, Editor(s)

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