Measurements of the thermodynamic parameters for CO laser gas mixtures excited by pulsed electron-beam sustained discharge

Leonid V. Seleznev; Andrei A. Ionin; Yurii M. Klimachev; Igor V. Kochetov; Andrei A. Kotkov; A. Yu. Kozlov; Alexander K. Kurnosov; Anatoly P. Napartovich; Dmitrii V. Sinitsyn; S. Vetoshkin

doi:10.1117/12.611078

23 March 2005 Measurements of the thermodynamic parameters for CO laser gas mixtures excited by pulsed electron-beam sustained discharge

Leonid V. Seleznev, Andrei A. Ionin, Yurii M. Klimachev, Igor V. Kochetov, Andrei A. Kotkov, A. Yu. Kozlov, Alexander K. Kurnosov, Anatoly P. Napartovich, Dmitrii V. Sinitsyn, S. Vetoshkin

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Proceedings Volume 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; (2005) https://doi.org/10.1117/12.611078
Event: XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2004, Prague, Czech Republic

Abstract

Time behavior of gas temperature in CO containing gas mixture excited in pulsed electron-beam sustained discharge (EBSD) was experimentally studied under different experimental conditions. To study time behavior of gas temperature, the fact that the gas temperature is equivalent to the rotational temperature of gas molecules was used. Rotational distribution of the excited states of CO molecule was reconstructed from measured small-signal gain dynamics on different ro-vibrational transitions. The time behavior of small-signal gain was obtained with probe low-pressure CW CO laser for ten ro-vibrational spectral lines. Gas mixtures CO:He=1 :4 and CO:N₂=1:9 typical for a CO laser were used. It was demonstrated that gas temperature grew from 1 10 K (initial temperature) up ~15O K for the first hundred microsecond after EBSD beginning and was staying at this value for a long time (more than 1 ms) for both gas mixtures. EBSD pulse duration was -3Oµs. The method of reconstruction of gas temperature time history was also applied for oxygen gas mixture CO:O₂=1:20 at gas pressure 0.04 atm, which was used for obtaining singlet delta oxygen in EBSD. The method can be used for diagnostic of non-equilibrium gas mixtures containing CO molecule.

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Leonid V. Seleznev, Andrei A. Ionin, Yurii M. Klimachev, Igor V. Kochetov, Andrei A. Kotkov, A. Yu. Kozlov, Alexander K. Kurnosov, Anatoly P. Napartovich, Dmitrii V. Sinitsyn, and S. Vetoshkin "Measurements of the thermodynamic parameters for CO laser gas mixtures excited by pulsed electron-beam sustained discharge", Proc. SPIE 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (23 March 2005); https://doi.org/10.1117/12.611078

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KEYWORDS

Gas lasers

Carbon monoxide

Oxygen

Temperature metrology

Molecules

Laser beam diagnostics

Continuous wave operation

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