Nowadays, the compact reliable multi-channel CO2 lasers have been developed which are intended for tackling technological problems of material processing. Among them are the JIH01.2HM, JIH-3.5HM lasers and the systems of even higher power. The paper presents the out comes of studying the spectral composition of multi-channel CO2 lasers, the results of evaluation of gas temperature active medium gain by radiation proper spectrum. The investigations are aimed at radiation power build- up, output characteristics improvement through the use of regeneration systems. The paper is also concerned with generation spectrum dependence on resonator length, output mirror reflectance, active medium pressure and composition, energy input.
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