On radiative lifetime measurement of chromium transitions in Cr doped ZnSe and ZnTe crystals using the frequency domain modulated infrared radiometry

The radiative lifetimes of chromium transitions in ZnSe:Cr crystal were determined by the modulated infrared radiometry method and the accuracy of the obtained data were analysed together with the recently studied from ZnTe:Cr crystal. The radiative lifetimes of chromium transitions in ZnSe:Cr crystal can be estimated from the photoluminescence response, additionally filtered out using an Inrasil window, with very good precision. Studying the influence of the light intensity on the estimation of the lifetime it was observed that with increasing light intensity the lifetime decreases. Also in ZnTe:Cr crystal it had been found, that with increasing light intensity the lifetimes decrease. However, whereas in ZnSe:Cr the accuracy of estimation error is independent on the light intensity in ZnTe:Cr the estimation error increases with the increasing light intensity.