Abstract
The efficiency of three-level and four-level laser quantum systems with gas-discharge and optical pumping has been analyzed. It has been shown that the practical efficiency of gas-discharge lasers on metal vapors mixed with inert gases with a collisional mechanism for creating population inversion does not exceed 1–3%. This fact is explained by the nonselective nature of excitation of energy levels of atoms and ions in a gas-discharge plasma. Use of the method of optical selective pumping of the upper working levels of atoms in combination with a collisional mechanism of creating population inversion with the help of laser diodes makes it possible to significantly increase the efficiency and output energy characteristics of the laser radiation. It is proposed to use a three-level diagram with collisional depopulation of the lower working level and a four-level diagram with collisional population of the upper level and depopulation of the lower level of the active medium working on transitions of atoms in vapors of rare-earth metals, actinoids, and group-III elements mixed with inert gases with optical pumping.
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