Spectroscopic evidence of inhomogeneous distribution of Nd~3+ in YVO_4, YPO_4 and YAsO_4 crystals

O. Guillot-Noel; B. Viana; B. Bellamy

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Spectroscopic evidence of inhomogeneous distribution of Nd~3+ in YVO_4, YPO_4 and YAsO_4 crystals

机译：Nd〜3 +在YVO_4，YPO_4和YAsO_4晶体中不均匀分布的光谱证据

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Nd~3- :YVO_4 is one of the most interesting laser hosts for micro and diode-pumped solid state lasers. We have studied magnetic and optical properties of Nd~3+ in three zircon type crystals YMO_4 (M = V, As, P). In particular, Nd~3+ ions exhibit in the three hosts a multisite character observed in the absorption and emission spectra. However, the emission and its dynamics are strongly dependant on the reabsorption mechanisms. In Nd:YVO_4, single crystals containing 7 ± 1 x l0~l8 Nd~3+ ions/cm~3, the lifetime is 95 ± 2 μs in good agreement with the calculated radiative lifetime. Electron Paramagnetic Resonance (EPR) measurements are performed to identify the nature of the different substitution sites for Nd~3- ions. Nd~3+ ions are found to be inhomogeneously distributed in tetragonal D_2d symmetry sites, in isolated ions, "shallow clusters" and pairs. Proportions of the different local environments depend on the total neo- dymium concentration. For instance, l5/100 of the Nd~3+ ions are gathered in Nd~3+--Nd~3+ pairs for 7.2 ± 0.2 x l0~l9 Nd~3+ ions/cm~3.

机译：Nd〜3-：YVO_4是微型和二极管泵浦固态激光器中最有趣的激光器主机之一。我们研究了三种锆石型晶体YMO_4（M = V，As，P）中Nd〜3 +的磁和光学性质。尤其是，Nd〜3 +离子在三个宿主中表现出在吸收光谱和发射光谱中观察到的多位点特征。但是，发射及其动力学在很大程度上取决于重吸收机理。在Nd：YVO_4中，单晶包含7±1 x l0〜18 Nd〜3 +离子/ cm〜3，寿命为95±2μs，与计算的辐射寿命吻合良好。进行电子顺磁共振（EPR）测量以鉴定Nd〜3-离子不同取代位点的性质。发现Nd〜3 +离子不均匀地分布在四边形D_2d对称位点，孤立离子，“浅簇”和成对离子中。不同局部环境的比例取决于总钕浓度。例如，Nd〜3 + -Nd〜3 +对中有15/100的Nd〜3 +离子以7.2±0.2 x 10〜19 Nd〜3 +离子/ cm〜3聚集。

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《Optical Materials》 |2000年第4期|p.427-437|共11页
作者
O. Guillot-Noel; B. Viana; B. Bellamy;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类工程材料学;
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Spectroscopic evidence of inhomogeneous distribution of Nd~3+ in YVO_4, YPO_4 and YAsO_4 crystals

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