掺镱磷酸盐玻璃Stark分裂的改性研究
文献类型：学位论文
| 作者 | 王朋 |
| 学位类别 | 硕士 |
| 答辩日期 | 2016 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 张丽艳 |
| 关键词 | 磷酸盐玻璃 Yb3+离子 Stark分裂 |
| 其他题名 | Study of the Stark splitting of Yb3+ in phosphate glass |
| 中文摘要 | 由于Yb3+特有的简单能级结构杜绝了激发态吸收、交叉驰豫、上转换等非辐射跃迁过程，综合其宽的吸收和发射带宽等优势，掺镱激光材料被广泛应用于超短脉冲激光和高功率激光领域。在众多激光材料基质中，激光晶体存在生长缓慢、生产成本高,难以满足高能量激光所需的大尺寸要求的缺点，而激光陶瓷由于受到材料纯度、内部气孔率、晶界结构、晶粒尺寸以及烧结工艺的影响,透光性和均匀性有待提高,虽然近几年激光晶体和陶瓷发展迅速，但短时间内无法满足高功率激光对基质材料的要求。激光玻璃中，相比于石英或硅酸盐激光玻璃，磷酸盐玻璃具有吸收发射截面大，荧光寿命长，非线性折射率小，光程长和温度系数小等突出的优点，因而成为使用最广泛的激光玻璃介质。因此理论上，Yb3+离子在磷酸盐玻璃中具有良好的激光输出表现，但实验发现，磷酸盐玻璃块体材料即便是在低温条件下也很难实现激光输出，原因在于磷酸盐玻璃中Yb3+下能级Stark分裂值较小，激光运行时下能级热拥塞问题严重，激光输出功率难以提高。本文以增大Yb3+离子在磷酸盐玻璃中Stark分裂为目的，对改性后的磷酸盐玻璃的物理性质和光谱性质进行了研究和分析。 本论文一共分为五章，第一章是文献综述，第二章是实验方法和相关理论，第三章和第四章是实验过程和实验结果分析，也是本文的核心内容，第五章是结论。 论文第一章首先介绍了激光的产生及其应用，然后概述了Yb3+的能级特点和配位结构以及掺镱磷酸盐玻璃的研究进展，最后提出了本课题主要的研究内容和思路。 论文第二章主要介绍了本文的研究方法，包括实验中玻璃样品的制备方法和过程，样品的加工测试以及光谱性能参数的计算，并详细介绍了实验数据处理的理论基础和方法。 论文第三章对经过SiO2改性的掺镱磷酸盐玻璃进行了细致的研究分析。以60P2O5-7.5Al2O3-15K2O-17.5BaO为实验组分，加入SiO2制备了改性的PS系列玻璃，对其吸收和荧光光谱进行洛伦兹分峰拟合，得到了对应Yb3+离子不同能级之间跃迁的荧光峰，并通过吸收光谱、荧光光谱和拉曼光谱的比较以及Yb3+的重心法则两种方法排除了荧光光谱中存在的干扰峰。绘制了Yb3+精细的能级结构，分析了SiO2的引入对Yb3+离子下能级Stark分裂值的影响，计算了Yb3+离子的晶体场强以及其周边配位体结构的非对称性，同时研究了PS系列磷酸盐玻璃光谱性能。 论文第四章是对第三章的补充与改进，为继续增大Yb3+在磷酸盐玻璃中下能级的Stark分裂值，向组分60P2O5-7.5Al2O3-15K2O-17.5BaO中加入不同含量的GeO2，着重研究改性的PG系列玻璃光谱和物理性能。分析了PG玻璃的玻璃DSC曲线和热膨胀曲线，得到了PG玻璃的转变温度以及抗热冲击性能的变化。对PG玻璃的吸收和荧光光谱进行分峰拟合处理，研究了GeO2的加入对Yb3+在简单组分磷酸盐玻璃中2F7/2能级的最大分裂值的影响。通过对PG玻璃拉曼光谱的分析，研究了PG玻璃结构和最大声子能量的变化。 最后是论文的结论，总结了全文的实验结果，并指出了本论文的创新点、不足和展望。 |
| 英文摘要 | Yb3+-doped materials have been widely used in ultrashort pulse and high power laser due to its simple energy lavel, wide absorption and emission bandwidth and the absensce of excited absorption, cross relaxation, up-conversion. Among the many laser materials, laser crystal and ceramic have developed very rapidly. But laser crystal has slow growth speed and high production costs. The transmittance and uniformity of laser ceramic are affected by purity of the material, internal porosity, grain boundary structure, grain size and sintering process.The inherent drawbacks of laser crystal and ceramic make them difficult to meet the requirements of high energy laser in a short time. Among the laser glasses, compared with silica or silicate glass, phosphate glass possesses large absorption and emission cross section, long fluorescence lifetime, small nonlinear refractive index, large optical path length and small temperature coefficient, it is the most widely used laser glass. Good laser output should be realized in Yb3+ doped phosphate glass theoretically, however it is difficult to achieve laser output in bulk phosphate glass materials even at low temperature. The reason is that a small Stark splitting level of Yb3+ in phosphate glass leads to a serious thermal effect and difficulties to increase the output power of the laser. This paper focus on the enlargement of the Stark splitting in phosphate glass and meanwhile the physical and spectral properties of the modified phosphate glass were also studied. This paper is divided into five chapters, the first chapter is a literature review, the second chapter introduces the experimental methods and theory, the core content of this paper ,Chapter there and four, discuss the experimental procedure and experimental results, chapter five is the conclusion. The first chapter introduces the laser and its application, energy levels, coordination structure of Yb3+ and research progressof Yb3+-doped phosphate glass. At last, the purpose and research topics of this paper were put forward. In second chapter, research methods, including the preparation of the glass samples, the test of samples, the spectral performance parameters calculation, detailed theory and methods of experimental data were presented. In chapter three, Yb3+-dpoed modified phosphate glass by SiO2 weas studied carefully. Based on the component 60P2O5-7.5Al2O3-15K2O-17.5BaO, PG glasses were produced by adding SiO2 , fluorescence peaks corresponding to different Yb3+ Stark splitting levels were got by Lorentz fitting of the absorption, emission spectra, the interfering peakswere excluded by the comparation of the absorption, emission , Raman spectra and the Yb3+ barycenter law. Detailed Stark splitting manifolds were depicted and the effect on Yb3+ Stark splitting was studied after adding SiO2. Then the rystal field strength and asymmetry of the Yb3+ ligand were calculated, meanwhile pectral properties of PS glasses wre studied. The chapter four is a supplement of the chapter three, in order to increase Stark splitting energy levels of Yb3+ in phosphate glass , different content of GeO2 were added to the component 60P2O5-7.5Al2O3-15K2O-17.5BaO, the spectral and physical properties of PG glass were studied. By analysing the DSC curve and thermal expansion curve, transition temperature and thermal shock resistance of PG glass were obtained. Absorption and emission spectra were processed with Lorentz fitting, the effect of additional GeO2 on 2F7/2 of Yb3+ was studied. The structure and the change of maximum phonon energy have been studied by Raman spectra. The last chapter is the conclusion. All results of present works have been concluded in this chapter. The innovation, shortage and outlook of this dissertation have been pointed out as well. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16973]  |
| 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 | 王朋. 掺镱磷酸盐玻璃Stark分裂的改性研究[D]. 中国科学院上海光学精密机械研究所. 2016. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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