Growth and spectroscopic characterisation of Tm3+/Yb3+ codoped LiGd(MoO4)2 crystal

摘要

The Tm3+/Yb3+:LiGd(MoO4)2 crystal with dimensions of Φ21 × 45 mm was grown by the Czochralski method. The spectroscopic properties of Tm3+/Yb3+:LiGd(MoO4)2 crystals were investigated. Based on the Judd-Ofelt theory, the oscillator strength parameters Ωt are: Ω2=16·468 × 10−20 cm2, Ω4=3·376 × 10−20 cm2, Ω6=2·613 × 10−20 cm2 for π-polarisation and Ω2=19·3 × 10−20 cm2, Ω4=1·582 × 10−20 cm2, Ω6=2·397 × 10−20 cm2 for σ-polarisation. The absorption cross-section σab are 4·17 × 10−20 cm2 at 796 nm and 5·31 × 10−20 cm2 at 797 nm for π- and σ-polarisation respectively. The emission cross-section σem are 1·72 × 10−20 cm2 at 1606 nm for π-polarisation and 2·00 × 10−20 cm2 at 1609 nm for σ-polarisation respectively. The Tm3+/Yb3+:LiGd(MoO4)2 crystals may be regarded as a potential infrared laser crystal.