HIGH-PRESSURE AND FLUORESCENCE LIFETIME OF THE E-2 LEVEL IN MGO-CR3+

The influence of high pressure (0-12 GPa) on the fluorescence lifetime tau of the E-2 level of Cr3+ ion in MgO crystal is considered. On the basis of the concept of changing the oscillator strength f, the spin- orbital coupling parameter xi, under high pressure, taking into accoun t that the position of the R line, the linear compression rate k and t he refractive index n are functions of pressure, the pressure-induced change of fluorescence lifetime tau for the E-2 --> (4)A(2) transition in MgO:Cr3+ has been calculated. Good agreement was found between the calculated and measured tau over the mentioned pressure range.