ABSTRACT
The lasing at self-contained transitions of metal atoms was achieved for the first time in lead vapours [1] in 1965, at the transition between the resonant level 6p7s 3P01 and one of the levels 6p
21D2 of the basic configuration, at a wavelength of 722.9 nm. Since then, many studies have been published that contain the results of research and development of lasers on self-contained transitions of metal atoms. Moreover, in the meantime numerous attempts have been made (see [2-7]) in some way to summarize the results of studies carried out by different groups, primarily in the USA and the former USSR.
