Kinetics of the active medium of a nuclear-pumped laser based on transitions in the cadmium atom

A kinetic model of the active medium is developed for a nuclear-pumped lase r (with an He-Cd-CCl4 mixture) based on transitions in the cadmium ion and atom. The results of numerical modelling give the distribution of the relax ation flux between excited states of the cadmium atom. A study is reported of the mechanisms responsible for the influence of the addition of carbon t etrachloride on the evolution of relaxation processes in an He-Cd plasma an d on stimulated emission of the lambda = 325.0 nm line. It is shown that th e main factor hindering lasing as a result of the 4d(9) 5s(2 2)D(3/2) --> 4 d(10) 5p P-2(1/2) transition is the parasitic absorption of the stimulated radiation by metastable cadmium atoms.