Spectroscopic properties of Dy3+-doped Na2Gd4(MoO4)7 crystal

A Dy3+:Na2Gd4(MoO4)7 crystal was successfully grown by the Czochralski method. Absorption spectra, emission spectra, and fluorescence decay curve of the crystal were measured at room temperature. The peak absorption cross sections of the 6H15/2→4I15/2 transition were 1.5 × 10-21 and 2.6 × 10-21 cm2 for σ and π polarizations, respectively, and both at 454 nm. The peak emission cross sections of the 4F9/2→6H13/2 transition were calculated to be 0.97 × 10-20 and 1.16 × 10-20 cm2 for σ and π polarizations, respectively, and both at 574 nm. The fluorescence lifetime and quantum efficiency of the 4F9/2 multiplet were estimated to be 152 μs and 56.7%, respectively. The results show that the Dy3+:Na2Gd4(MoO4)7 crystal may be a potential gain medium of 574 nm yellow laser pumped by a blue laser diode.