Abstract
The complex effects of the sensitisation of laser crystals on the spectral and temporal behaviour of the activator emission is discussed. It is thus shown that the mutual crystal-field perturbations produced by the sensitizer S and activator A ions transforms the systems formed by these ions into inhomogeneous systems composed of homogeneous subsystems, which are further individualised by specific manifestation of the S-A energy transfer processes. A suitable rate equation modelling for each of the S-A subsystems which takes into account the energy transfer between the subsystems enables a correct description of the emission properties in various laser crystals under selective or non-selective pump.
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