Jet dye laser pumped by copper vapor laser

Abstract

A scheme for calculating populations of excited levels and intensities of spectral lines in the positive column of helium discharges at intermediate pressures ( p > 5 Torr) is proposed. The electron distribution obtained from the Boltzman equation is taken into account. The distribution is strongly non-Maxwellian for electrons of energy more than 19.8 eV.Concentrations of atoms on excited levels (n= 2, 3, 4, 5) are obtained from balance equations for the population of those levels. The concentration of level 2 % is the highest. The concentration of 2 % is much less than that which would exist in the case of quasithermodynamic equilibrium between levels 2% and 2IS. The population of higher levels (n> 2) is determined by excitation from levels 23s and 2% For singlet levels the excitation from level 2% is important.Population inversion is obtained between levels 3lP-3ID, 4 I P 4 D , S1S4'P, 43S-33P, 53%I3P and 5 3 P 4 D .