Growth process and optical investigations of Nd:NaGd (MoO4)(2) crystals with varying content of Nd and Gd
Growth process and optical investigations of Nd:NaGd (MoO4)(2) crystals with varying content of Nd and Gd
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不同 Nd 和 Gd 含量 Nd:NaGd (MoO4)(2) 晶体的生长过程和光学研究
DOI：
10.1002/crat.201500228
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发表时间：
2016
影响因子：
1.5
通讯作者：
Zhen Li
中科院分区：
文献类型：
--
作者：
Wu Lidan;Chen Zhenqiang;Wu Yonghua;Liu Guangjin;Li Anming;Hao Yin;Zhu Siqi;Zhen Li
本文用Czochralski法在950℃下生长了x = 0.005 ~ 0.05的[NaGd1‐xNdx](MoO4)2晶体10小时，并用吸收光谱和荧光光谱对其进行了表征。利用Judd‐Ofelt理论计算了Nd3+的强度参数，并分析了参数与Nd3+浓度的关系。结果表明，随着Nd3+浓度的增加，振荡强度、受激发射截面、Ωtand自发跃迁概率略有降低，而荧光寿命明显降低。然而，随着Nd3+浓度的增加，荧光分支比几乎没有变化。（x= 0.01）的[NaGd1‐xNdx](MoO4)2晶体具有最高的量子效率（88.98%），荧光线宽度为23 nm， σem·τ值高达0.55 × 10−22cm2·s，在1064 nm处从4f3 /2跃迁到4i11 /2的受激发射截面高达3.747 × 10−19cm2。测试结果表明，[NaGd1‐xNdx](MoO4)2晶体是固体激光系统中一种优良的增益介质。
In this paper, [NaGd1‐xNdx](MoO4)2crystals with x = 0.005–0.05 were grown by Czochralski method at 950 ℃ for 10 hours and subsequently characterized by absorption spectroscopy and fluorescence spectroscopy. The intensity parameters of Nd3+were calculated by Judd‐Ofelt theory, and the relationship between the parameters and Nd3+concentration was analyzed. The results show that with the increasing Nd3+concentration, the oscillator strength, stimulated emission cross‐section, Ωtand spontaneous transition probability decrease slightly, while the fluorescence lifetime decreases significantly. However, the fluorescence branching ratio is almost unchanged with the increasing Nd3+concentration. The [NaGd1‐xNdx](MoO4)2crystal with (x= 0.01) possesses the highest quantum efficiency of 88.98%, a good fluorescence line‐width of 23 nm, a large value of σem·τfup to 0.55 × 10−22cm2·s and a stimulated emission cross‐section up to 3.747 × 10−19cm2for the transition from4F3/2to4I11/2at 1064 nm. Test results indicate that [NaGd1‐xNdx](MoO4)2crystals are an excellent gain media for the solid state laser system.