Bulg. J. Phys. vol.43 no.3 (2016), pp. 224-232

Theoretical and Experimental Study on Some Plasma Parameters and Thermophysical Properties of Gas Discharges Used for Excitation of Powerful Metal and Metal Halide Vapour Lasers

K.A. Temelkov, S.I. Slaveeva, Yu.I. Fedchenko
Metal Vapour Lasers Laboratory, Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
Abstract. Powerful metal halide vapour lasers are excited with nanosecond pulsed longitudinal discharge in complex multicomponent gas mixtures. Using a new method, thermal conductivity of various multicomponent gas mixtures is obtained under gas-discharge conditions, which are optimal for laser operation on the corresponding metal atom and ion transitions. Assuming that the gas temperature varies only in the radial direction and using the calculated thermal conductivities, an analytical solution of the steady-state heat conduction equation is found for uniform and radially nonuniform power input in various laser tube constructions. Using the results obtained for time-resolved electron temperature by measurement of electrical discharge characteristics and analytically solving steady-state heat conduction equation for electrons as well, radial distribution of time-dependent electron temperature is also obtained for the discharge period.

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