The paper reports up to day progress in investigations and developments of ion metal vapor lasers, excited by three of the most effective processes in gas discharge plasma, namely, by collisions of metal atoms with electrons, by the collisional-radiative recombination of doubly-charged metal ions and by heavy-body collisions of the metal atoms with buffer gas ions or metastables. The main attention given to the latter type of excitation in the plasma of pulsed hollow cathode discharge and the output characteristics are presented and discussed. The output characteristics of the hollow cathode discharge ion laser with combine active media (He-Kr-Hg mixture) emitted on (lambda) 469,4 nm Kr+ and (lambda) 615 nm Hg+ lines are presented.
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