Saturable Absorption - Phenomenology of Saturable Absorption

Phenomenology of Saturable Absorption

Within the simple model of saturated absorption, the relaxation rate of excitations does not depend on the intensity Then, for the continuous-wave operation, the absorption rate (or simply absorption) is determined by intensity :

where is linear absorption, and is saturation intensity. These parameters are related with the concentration of the active centers in the medium, the effective cross-sections and the lifetime of the excitations.