Preparation and luminescence properties of Yb3+ activated Gd2GeO5
Preparation and luminescence properties of Yb3+ activated Gd2GeO5
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DOI：
10.1016/j.jallcom.2012.10.168
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发表时间：
2013-04
影响因子：
6.2
通讯作者：
L. Ding;Qingli Zhang;Wenpeng Liu;S. Yin
中科院分区：
文献类型：
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作者：
L. Ding;Qingli Zhang;Wenpeng Liu;S. Yin
采用固相反应法制备了Yb：Gd 2GeO 5多晶，并对其结构、光谱性质和能量结构进行了研究。Yb：Gd_2GeO_5晶体属于P21/c空间群，其光致发光光谱范围为975 ~ 1088 nm，是目前已知的Yb ~（3+）较宽的发光范围之一。宽发射光谱是超短激光运转和激光调谐所必需的。用简单重叠模型计算了Gd 2GeO 5晶体的晶场参数Bqk和Yb 3+在两个对称位置的能级。计算得到的能级与实验值吻合得很好。在Gd 2GeO 5中，Yb 3 + 2F 7/2基态的能量分裂高达1065 cm −1。根据玻尔兹曼分布，最高激光终端能级的热布居比约为0.605%，比YAG的2.32%小一个数量级，这非常有利于布居反转。结果表明Yb：Gd_2GeO_5是一种很有前途的超短脉冲可调谐全固体激光晶体材料。
Polycrystalline Yb:Gd2GeO5was prepared by solid state reaction method, and its structure, spectral properties, and energy structure were studied. The Yb:Gd2GeO5belongs to space group P21/c, and its photoluminescence spectrum includes the range from 975 to 1088nm which is one of the known broader emission of Yb3+. The broad emission spectrum is necessary for ultrashort laser operation and laser tuning. Crystal field parameters Bqkand energy levels of Yb3+at two symmetry sites in Gd2GeO5were calculated by the simple overlap model, respectively. The calculated energy levels are consistent with the experimental very well. The energy splitting of Yb3+2F7/2ground state in Gd2GeO5is up to 1065cm−1. According to Boltzmann distribution, the thermal population ratio of the highest terminal laser level is about 0.605% and less than 2.32% of YAG by one order, which is very beneficial to population inversion. All results indicate that Yb:Gd2GeO5may be a promising laser crystal material for ultrashort and tunable all-solid laser.