Bulg. J. Phys. vol.28 no.1-2 (2001), pp. 39-49

Numerical Model of Laser Level Population in Helium-Cadmium Gas

I. Iliev1, S. Gocheva-Ilieva2, N. Sabotinov3
1Department of Physics, Technical University of Plovdiv, 8 Tzanko Dustabanov Street, 4000 Plovdiv, Bulgaria
2Department of Applied Mathematics and Modeling, Paisii Hilendarski University of Plovdiv, 24 Tsar Assen Street, 4000 Plovdiv, Bulgaria
3Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd, 1784 Sofia, Bulgaria
Abstract. A numerical model of eight energy levels describing the population of laser upper level Cd(II) 5s2 2D5/2 for the line 441.6 nm in a cross section of He-Cd radio frequency gas discharge is presented. An optimization of the laser level population with respect to the applied electrode voltage at a constant electric power is carried out. It is established that under certain conditions the principle population mechanisms are the stepwise electron excitation and/or the Penning effect. Engineering solutions for effective control of the laser emission are proposed.

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