Abstract
Abstract Room-temperature polarized spectral properties of the Er:CaGdAlO 4 crystal are reported. The Judd–Ofelt theory was applied to analyze the polarized absorption spectra and then calculate the spontaneous emission probabilities, radiative lifetimes, and branch ratios. Room-temperature fluorescence lifetimes of the 4 I 13/2 , 4 I 11/2 , 4 F 9/2 , and 4 S 3/2 multiplets for Er 3+ ions were measured. Stimulated emission cross-sections of the 4 I 13/2 → 4 I 15/2 transition obtained by the Fuchtbauer–Ladenberg formula and the reciprocity method were compared. The results show that the Er:CaGdAlO 4 crystal may be a potential gain medium for a low-threshold 1.55 μm laser.
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