镱铒共掺含硅磷酸盐玻璃及物理和光谱性质研究
文献类型：学位论文
| 作者 | 陈尤阔 |
| 学位类别 | 硕士 |
| 答辩日期 | 2008 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 陈伟 |
| 关键词 | 掺铒磷酸盐玻璃 氧化硅 物理性质 光谱性质 |
| 其他题名 | Physical and spectroscopic properties of ytterbium-erbium codoped phosphate glasses containing silica |
| 中文摘要 | 本论文包括以下四个部分：文献综述、实验方法和理论基础、实验结果与讨论、结论。 论文第一章首先总结了掺铒激光玻璃的应用概况，介绍了掺铒激光玻璃的发展历程和研究进展。同时，简单介绍了镱铒共掺玻璃的光谱性质特点。分析了当前掺铒磷酸盐玻璃的发展中存在的问题，在此基础上提出本文的研究依据和研究方向：能否通过往磷酸盐玻璃中引入SiO2达到强化玻璃基质，同时不使玻璃光谱性质下降太多。 第二章介绍了本文实验中所使用的研究方法和理论基础，包括玻璃样品的制备、各种性质的测试手段，以及光谱理论的计算方法包括拉曼光谱在玻璃结构研究中的作用和Judd-Ofelt理论分析稀土离子光谱的方法。 论文的第三章是本文的核心部分，详细研究了SiO2对掺铒磷酸盐玻璃的物理性质、光谱性质和结构特性的影响。首先通过对(79.5-x)(0.94P2O5-0.06Al2O3)-15Na2O-xSiO2 -5Yb2O3-0.5Er2O3，（x=0，5，10，15，20）玻璃系统的密度、折射率、硬度、玻璃转变温度和热膨胀系数的测定，研究了SiO2的引入对磷酸盐玻璃物理性质的影响。结果表明，SiO2含量增加使玻璃的密度、折射率、硬度和玻璃转变温度上升，玻璃的热膨胀系数则在SiO2含量为10 mol%附近时有最小值。 研究了含SiO2的Yb-Er共掺磷酸盐玻璃的光谱性质。Er3+离子的受激发射截面随SiO2含量的增加而减小；加入20 mol% SiO2时，受激发射截面只下降了大约7%，和Al2O3相比，SiO2对Er3+离子受激发射截面的影响较小。加入5 mol%的SiO2使Er3+离子的荧光有效线宽明显减小，但进一步增加SiO2含量对有效线宽的影响很小。J-O强度参数Ω2受SiO2含量的影响不大；Ω4和Ω6随SiO2含量的增加而减小，减小的幅度也很小。研究结果表明，添加20 mol%以内的SiO2对Yb3+、Er3+共掺磷酸盐玻璃受激发射截面的影响是很有限的。 通过拉曼光谱对玻璃结构进行研究，SiO2的加入使磷与非桥氧间的键长变长、磷氧双键数量减少。拉曼光谱的分析结果表明，四配位的硅氧四面体[SiO4]和六配位硅氧八面体[SiO6]同时存在于玻璃中，且二者的相对比例[SiO6]/[SiO4]随SiO2含量的增加而减小。 第三章的最后讨论了玻璃结构同性质之间的关系。玻璃的物理性质主要受Si配位数的影响。Si在玻璃中形成六配位的硅氧八面体时，能够交联磷酸盐长链，起到增强玻璃结构网络的作用，从而使玻璃的密度、折射率、硬度和转变温度明显上升，热膨胀系数下降；形成四配位的硅氧四面体时，对结构网络的影响较小。对玻璃的光谱性质和结构之间的关系作了简单讨论，玻璃的光谱性质只发生了很小的变化，这和拉曼光谱分析的结果是一致的：20 mol%以内SiO2的加入并没有使玻璃网络主体结构发生明显改变。 论文的第四章是对本实验所有研究结果的总结，并指出了研究中存在的不足和需要进一步改进的地方。 |
| 英文摘要 | This thesis is composed of four sections, including literature summarizations, experimental procedure and basic theory, results and discussion, and the general conclusions. In the first chapter, the developing history, as well as the application status and prospect, of erbium doped phosphate glasses are summed up. The spectroscopic properties of Yb-Er codoped glasses are also introduced. The objective of our study, which is proposed based on the main drawback of present erbium doped phosphate glasses, is that if it is possible to strengthen the phosphate glass base without severely degrading the spectroscopic properties through the introduction of SiO2. In the second chapter, the experimental methods and basic theories, including the preparation procedures of glasses, property measurements are introduced. The spectroscopic theories, especially the application of Raman spectroscopy on the structural study of glass and the application of Judd-Ofelt theory on the analysis of rare earth spectroscopic properties, are also introduced. As the core section of this dissertation, chapter 3 presents the effect of the addition of SiO2 on physical properties, spectroscopic properties and structural characteristics of erbium doped phosphate glasses. The physical properties of (79.5-x)(0.94P2O5-0.06Al2O3)-15Na2O-xSiO2 -5Yb2O3-0.5Er2O3 (x=0, 5, 10, 15, 20) glasses, including density, refractive index, hardness, glass transition temperature and thermal expansion coefficient, were investigated. Regarding the density, refractive index, glass transition temperature and hardness, each of them increases with increasing content of SiO2. The thermal expansion coefficient has its minimum value when the content of SiO2 is 10 mol%. The spectroscopic properties of Yb-Er codoped phosphate glasses were also studied. Within the range of 0-20 mol% SiO2 addition, the stimulated emission cross-section of Er3+ ion only decreases by about only 7%. Compared to Al2O3, the effect of SiO2 on the spectroscopic properties of Er doped glasses is relatively small. Regarding the Judd-Ofelt intensity parameters of Er3+, Ω2 does not change greatly, but Ω4 and Ω6 decrease gradually with increasing SiO2 content. The effective linewidth of Er3+ decreases from 55.7 nm to 53.9 nm with the SiO2 content increases from 0 to 5 mol%, and remains nearly unchanged with further addition. The structure of glass network was characterized by Raman spectroscopy. The Raman spectra of the glasses indicate the increase in bond length between P5+ and non-bridging oxygen, as well as the decrease in the number of P=O bonds, with the addition of SiO2. Raman spectroscopic analysis result reveals that [SiO4] and [SiO6] coexist in our glass, and the ratio of [SiO6]/[SiO4] decreases with increasing content of SiO2. The relationship between structural characteristics and glass properties is discussed at the end of this chapter. The physical properties are related to the coordination situation of Si4+ in the glasses. When taking octahedral sites, Si4+ ions interconnect the phosphate chains and strengthen the glass network, resulting in the increase of density, refractive index, hardness and glass transition temperature, along with the decrease of thermal expansion coefficient. The Si4+ ions taking the tetrahedral sites have inconsiderable effect on glass network. Within 20 mol% SiO2 addition, the spectroscopic properties change unremarkably, which is consistent with the evolution of Raman spectra that the glass structure does not change significantly. Chapter 4 summarizes the results achieved of this dissertation, as well as the insufficiencies of this work and issues that need further studying. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16389]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 陈尤阔. 镱铒共掺含硅磷酸盐玻璃及物理和光谱性质研究[D]. 中国科学院上海光学精密机械研究所. 2008. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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