Spectral properties of Tm3+:NaGd(MoO4)2 crystal

The Tm3+:NaGd(MoO4)2 crystal with dimensions of Φ 15 × 38 mm2 was grown by Czochralski method. Polarized absorption and fluorescence spectra at room temperature were investigated. The absorption bands attributed to 3H6 → 3H4 transition have large absorption cross-sections, which are 3.99 × 10−20 and 2.36 × 10−20 cm2 for σ- and π-polarization, respectively. The emission bands corresponding to the 3H4 → 3H6 transition are strong and broad with emission cross-sections of 1.33 × 10−20 and 1.20 × 10−20 cm2 for σ- and π-polarization, respectively. The correlative full widths at half maximum are 35 nm for σ-polarization and 36 nm for π-polarization. The fluorescence lifetime for the 3H4 → 3F4 transition is 146 μs and the luminescent quantum efficiency is 76.8%.