Spectroscopic investigation of Dy3+-doped Li2Gd4(MoO4)7 crystal for potential application in solid-state yellow laser

Abstract Dy 3+ :Li 2 Gd 4 (MoO 4 ) 7 crystal with dimensions of ∅20 × 25 mm 3 has been grown by the Czochralski method. The spectroscopic properties of Dy 3+ :Li 2 Gd 4 (MoO 4 ) 7 crystal have been investigated. Based on the analysis of polarized absorption spectra in the framework of the Judd–Ofelt theory, the main spectroscopic characteristics, including the phenomenological intensity parameters, spontaneous transition probabilities, fluorescence branching ratios and radiative lifetimes of Dy 3+ in the crystal, have been determined. The emission cross-sections for the 4 F 9/2  →  6 H 13/2 transition of special interest for laser application have been calculated using the Fuchtbauer–Ladenburg (F–L) equation. The fluorescence and radiative lifetimes of 4 F 9/2 manifold are equal to 126.5 μs and 201.1 μs, respectively, which mean the quantum efficiency is 62.9%. The results propose the possibility of Dy 3+ :Li 2 Gd 4 (MoO 4 ) 7 crystal for solid-state yellow laser pumped by commercially available blue laser diodes.