Nd3+:LiLa(MoO4)2晶体生长、光谱和激光特性

本论文报道了Nd3+:LiLa(MoO4)2晶体生长、光谱和激光特性.采用提拉法生长出尺寸为φ20×34mm3的Nd+3+:LiLa(MoO4)2晶体.应用Judd-Ofelt理论计算了Nd3+离子在Nd3+:LiLa(MoO4)2晶体中唯象强度、自发发射跃迁几率、荧光分支比、辐射跃迁寿命和荧光量子效率.Nd3+:LiLa(MoO4)2晶体的偏振吸收跃迁截面分别为9.52×10-20cm2(π-偏振)和4.46×10-20cm2(σ-偏振).它的偏振发射跃迁截面分别为0.67×10-19cm2(σ-偏振)和1.02×10-19cm2(σ-偏振).在氙灯泵浦下,获得74.4mJ的1.06μm的激光输出,激光阈值为0.676J,激光总效率和斜率效率分别为0.39;和0.48;.

Growth, Spectroscopic and Lasing Characteristics of Nd3+: LiLa (MoO4)2 Crystal

Nd3+: LiLa(MoO4)2 crystals with dimension φ20×34mm3 have been grown by Czochralski method. The spectroscopic characteristics of Nd3+:LiLa(MoO4)2 crystals were investigated. Based on Judd-Ofelt theory, the spectral parameters, such as the intensity parameters Ωλ (λ = 2, 4, 6 ), the spontaneous emission probability, the fluorescence branching ratios, the radiative lifetime and the fluorescence quantum efficiency have been obtained. The absorption cross sections are 9.52 and 4.46 ×10-20cm2 for π - and σ-polarization, respectively. The emission cross sections are 0.67 and 1.02 × 10-19cm2 for π- and σ-polarization, respectively. Under the single Xenon flash lamp pumped, the maximum pulse laser output was 74.4 mJ at 1.06μm. The laser energy threshold value Eth was 0.676J. The overall and slope efficiencies were 0.39% and 0.48%. Nd3 + :LiLa( MoO4 )2 crystal is suggested as a potential high efficient laser crystal for diode laser pumping.