Thermal dependence of the Cr-to-Nd energy transfer in lanthanum lutetium gallium garnet

Photoluminescence, excitation, and response to pulsed excitation measuremen ts show the existence of the Cr3+-to-Nd3+ energy transfer in lanthanum lute tium gallium garnet with an efficiency eta = 0.59 at room temperature. The transfer occurs radiatively and nonradiatively, and both transfer rates are temperature dependent within 15-550 K. The nonradiative transfer rate, cal culated as a function of temperature by using the lifetime data of the Cr3 ion in the crystal, increases slowly with increasing temperature.