Thermal and polarized spectroscopic characteristics of Nd3+:LiLa(WO4)2 crystal

Abstract

Abstract The thermal and polarized spectroscopic characteristics of Nd 3+ :LiLa(WO 4 ) 2 crystals have been investigated. The hardness of Nd 3+ :LiLa(WO 4 ) 2 crystal is 389.7 VDH. The specific heat at 330 K is 0.47 J g −1 K −1 . The thermal expansion coefficients for c - and a -axes are 7.70 × 10 −6 and 14.63 × 10 −5 °C −1 , respectively. The spectral parameters have been determined by Judd–Ofelt theory and Fuchtbauer–Ladenburg formula. The intensity parameters Ω t obtained are Ω 2 = 12.914 × 10 −20 cm 2 , Ω 4 = 3.79 × 10 −20 cm 2 , Ω 6 = 3.72 × 10 −20 cm 2 . The radiative and fluorescence lifetimes are 145 and 165 μs, respectively. The quantum efficiency is 91.9%. The absorption band at 805 nm has an FWHM of around 20 nm for both π- and σ-polarizations. The absorption cross-sections at 805 nm are 2.91 and 2.83 × 10 −20 cm 2 for π- and σ-polarizations, respectively. The stimulated emission cross-sections are 8.899 and 7.787 × 10 −20 cm 2 for π- and σ-polarizations, respectively.