Nd:YAG quantum efficiency and related radiative properties
Nd:YAG quantum efficiency and related radiative properties
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DOI：
10.1109/3.34046
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发表时间：
1989-08
影响因子：
2.5
通讯作者：
D. Devor;L. Deshazer;R. Pastor
中科院分区：
文献类型：
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作者：
D. Devor;L. Deshazer;R. Pastor
测量了10种不同晶体的量子效率，结果表明量子效率从0.47到0.87不等。在光致变色晶体中，可以通过色心的形成来降低量子效率，或者通过漂白来提高量子效率。色心漂白是通过氧化进行的，使用高温反应气氛过程来控制与羟基杂质有关的晶体缺陷。考察了离子-离子和离子-晶格相互作用效应，进一步证明了Nd/SuP3+/荧光猝灭中心的存在。研究了荧光率、非等效晶场效应、谱线展宽、Nd/Sup+3/晶格-缺陷相互作用及其与温度的关系。在所有的晶体样品中都发生了Nd/SuP3+/位的微扰。在液氦温度下，5个NCFNd/sup~(3+)/位的Stark能级发生了6 cm/sup~(-1)/位到位的斯塔克能级位移。较小的比例漂移是特定样本的特征。虽然检查的晶体显示出个体差异，但只有与羟基有关的显色提供了猝灭中心的具体证据。>；
Measured quantum efficiencies of ten different Nd:YAG crystals show a variation from 0.47 to 0.87. In phototropic crystals, the quantum efficiency can be degraded by color center formation or improved by bleaching. Color center bleaching occurs by oxidation, using a high-temperature reactive atmosphere process to control crystal defects related to hydroxyl impurities. Ion-ion and ion-lattice interaction effects are examined for further evidence of Nd/sup 3+/ fluorescence quenching centers. Fluorescence rates, nonequivalent crystal field (NCF) effects, line broadening, Nd/sup +3/ lattice-defect interactions, and their temperature dependences are studied. Nd/sup 3+/ site perturbations occur in all crystal samples. Five NCF Nd/sup 3+/ sites show 6 cm/sup -1/ site-to-site Stark level shifts at liquid helium temperatures. Smaller scale shifts are characteristic of particular samples. While the crystals examined show individual differences, only hydroxyl-related coloration provides specific evidence of quenching centers. >