Abstract
TbAl3(BO3)4 and Dy3+:TbAl3(BO3)4 crystals were grown by the top-seeded solution method and the polarized optical spectra of the crystals were investigated at room temperature. Peak absorption cross-sections for the 6H15/2 → 4I15/2 transition of Dy3+ in the Dy3+:TbAl3(BO3)4 crystal are 1.2 × 10−21 cm2 at 453 nm and 0.6 × 10−21 cm2 at 452.4 nm for σ and π polarizations, respectively. Under excitation at 453 nm, a strong green fluorescence of Tb3+ around 541 nm was observed in the Dy3+:TbAl3(BO3)4 crystal due to the efficient energy transfer from Dy3+ to Tb3+ ions. Peak emission cross-sections for the 5D4→7F5 transition of Tb3+ in the Dy3+:TbAl3(BO3)4 crystal are 2.8 × 10−21 and 1.5 × 10−21 cm2 at 541 nm for σ and π polarizations, respectively. Fluorescence lifetime of the 5D4 level of Tb3+ is 1.4 ms and the efficiency of energy transfer from Dy3+ to Tb3+ ions is about 92% in the Dy3+:TbAl3(BO3)4 crystal. The results show that a commercial high-power 450 nm diode laser may be used as the pumping source for Dy3+/Tb3+ co-doped crystal to realize Tb3+ visible laser.
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