Proceedings - Viện Vật lý

_________________________________________________________________________________Những tiến bộ trong Quang học, Quang tử, Quang phổ và Ứng dụng. 8/2006, Cần Thơ, Việt Nam2.2.2. Inversion densityOnce A(E in ) is known, it is possible to calculate the inversion density undervarious conditions. When the lasing is inhibited by blocking the optical beam (forexample, Q-switch), or by removing one or both of two resonator mirrors, themaximum normalized inverted population density N = n/n 0 that is achievable with aflashlamp pulse of input energy is obtained from the relation (4):N =1 - 2 exp [- A(E in )] (20)Relation (20) is valid only under the condition W