Chinese Optics Letters, Volume. 5, Issue s1, 240(2007)
Broadband laser materials and the McCumber relation
The McCumber relation can be deduced without assuming that all active centers have the same structure of sublevels. The range of validity of the McCumber relation is the same as that of the effective emission cross-section.
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Dmitrii Kouznetsov, "Broadband laser materials and the McCumber relation," Chin. Opt. Lett. 5, 240 (2007)