Kirichok, A.V.; Kuklin, V.M.; Mischin, A.V.; Zagorodny, A.G.
(Вопросы атомной науки и техники, 2018)
A change in the character of maser generation in a two-level system is found when the initial population inversion exceeds some threshold value equal to the square root of the total number of atoms. Above this threshold, ...