Measurement of vibrational temperatures in the working chamber of a technological electric-discharge CO2 laser

Achasov, O. V.; Kukiello, P.; Labuda, S. A.; Lavinskaya, E. I.; Slivinskii, G.

doi:10.1007/bf00853023

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“…The stabilized, total discharge current of 80 electrode segments was equal to 6, 8, 10 and 12 A in different runs which corresponded to the electrode gap voltage 800 V< U AC < 1700 V. A detailed description of the laser system under consideration has been given elsewhere [10]. Briefly, the basic geometrical and discharge parameters of the MLT 1200 laser were as follows: the volume of the discharge zone was 2.5 cm×4 cm×100 cm, the ratio of the discharge volume to the laser chamber volume was 1/1000, the gas flow velocities in the discharge zone were in the range 60-65 m s −1 and the average gas mixture temperature in the discharge zone measured by spectroscopic method T g was about 400 K [11]. The MLT 1200 laser employed a stable, plano-convex resonator folded into three-pass or four-pass configurations.…”

Section: The Experimental Set-upmentioning

confidence: 99%

Improvement of self-regeneration of gas mixtures in a convection-cooled 1.2 kW laser

Cenian

Chernukho

Kukiello

et al. 1997

J. Phys. D: Appl. Phys.

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Degradation of gas mixtures and methods of its reduction in lasers were studied with reference to the DC-excited, transverse-flow CW laser of MLT 1200 type. The long-term output characteristics and their dependence on the mixture's composition determined in the experiment gave a hint concerning the thorough theoretical analysis of decomposition in laser mixtures. The observed optimal concentration of lies within the range and that of is about 2 - 3% for the laser under consideration. In the theoretical analyses of available data we focus our attention on the roles played by the gas pressure, the mixture composition and the growth of the afterglow region in the reduction of working gas degradation. The equilibrium conversion decreases with increasing gas pressure. A 50% reduction in is obtained when the pressure increases from 13.33 to 46.66 hPa. The observed optimal composition corresponds to low reactivity of the laser plasma with a small oxygen content. The optimal period for the laser gas mixture to reside in the afterglow region is larger by a factor of 1000 than the discharge residence time. The relatively small value of the equilibrium conversion in the MLT 1200 laser results from relatively high concentrations of atomic and electronically excited species. The formation of atomic oxygen is inhibited by reactions with electronically excited molecules, especially . Only very small concentrations of and , which are the most harmful reaction products, result according to our calculations for the MLT 1200 system.

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Section: The Experimental Set-upmentioning

confidence: 99%