- In this paper a theoretical model for transient behavior analysis of the discharge current pulse in the transversely excited atmospheric pressure CO2 laser with pin array pre-ionization is presented. The laser discharge tube is modeled by a non-linear RLC electric circuit. By this method the governing partial differential equations are reduced to a system of ordinary differential equations. The equations are solved numerically by the fourth order Runge–Kutta numerical method and sum important variables such as Current and Voltage of the main discharge, Resistance of the plasma column and Electron density in the main discharge region as a function of time, will be calculated.

Keywords: Pin array pre-ionization, RLC electric circuit, TEA CO2 laser.

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