Abstract
The near UV and visible emissions of Ho 3+ in YAP and YAG are investigated after selective one photon pumping of the 3D 3 and 5S 2 manifolds. The fluorescence decays of Ho 3+ ions after pulsed excitation are measured as a function of temperature and holmium concentration. The shortening and non-exponentiality of the decays, observed with increasing activator concentrations, are indications of cross-relaxation (CR) among the Ho 3+ ions. The CR schemes are proposed for both emitting 3D 3 and 5S 2 manifolds and the values for the transfer rates are experimentally determined and compared to the Inokuti–Hirayama theory. Mechanisms responsible for the temperature quenching are studied.
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