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Proceedings Paper

Diagnostics of a fast-axial-flow CO2 laser active medium using a diode laser spectroscopy technique
Author(s): Maxim Spiridonov; David J. Toebaert; E. Desoppere
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Paper Abstract

The diode laser spectrometer operating in the 4.5 micrometers region with a spectral resolution of about 10-4 cm-1 was applied to investigate the active medium of a dc-excited fast-axial-flow CO2 laser. Detailed distributions of the CO2 molecules over the rotational and vibrational levels in a glow discharge plasma have been obtained, and corresponding temperatures have been derived. The vibrational distribution involves more than 30 levels from all vibrational modes of CO2. The bending and symmetric stretch temperatures were found to be equal within an experimental error of 2 to 4%. A dissociation degree of CO2 molecules was measured. A very high concentration of nitrogen oxides in a glow discharge was detected. Because of a strong influence of nitrogen oxides on negative ions formation and the discharge stability, such a high density of nitrogen oxides is probably the main factor limiting the energy loading to the discharge and the fast-axial-flow laser efficiency.

Paper Details

Date Published: 26 January 1994
PDF: 5 pages
Proc. SPIE 2205, 11th Symposium and School on High-Resolution Molecular Spectroscopy, (26 January 1994);
Show Author Affiliations
Maxim Spiridonov, General Physics Institute (Russia)
David J. Toebaert, State Univ. of Ghent (Belgium)
E. Desoppere, State Univ. of Ghent (Belgium)

Published in SPIE Proceedings Vol. 2205:
11th Symposium and School on High-Resolution Molecular Spectroscopy
Alexander I. Nadezhdinskii; Yu V. Ponomarev; Leonid N. Sinitsa, Editor(s)

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