Kinetics of the active medium of a multiwave IR xenon laser in hard-ioniser-pumped mixtures with He and Ar. I. Electron-beam pumping

A description is given of a detailed nonsteady-state multiwave kinetic model of a laser, based on xenon atom transitions with $\lambda$ = 1.73, 7.03, 2.65, 2.63, 3.37, and 3.51 $\mu$m in an He – Ar – Xe mixture pumped by a hard ioniser. The proposed kinetic model is tested against the results of experiments on electron-beam pumping of an Xe laser containing pure xenon, as well as binary and ternary mixtures. Numerical modelling is used to identify the main mechanisms pumping the upper active levels: three-particle recombination of atomic Xe$^+$ ions (He – Xe mixture), dissociative recombination of molecular Xe$_2^+$ ions (pure Xe), dissociative recombination of molecular ArXe$^+$ ions and electron excitation from the 6$s'$ xenon atom states in an (He) – Ar – Xe mixture. It is shown that the contribution of each of the mechanisms to pumping of the upper active level is determined by the composition and pressure of the mixture.