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题名	使用显微荧光法探测钕玻璃中的亚表面缺陷
作者	王威
学位类别	硕士
答辩日期	2014
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	掺钕磷酸盐激光玻璃 亚表面缺陷 显微荧光法 罗丹明6G
其他题名	Using Microscope Fluorescence Technology to Detect Subsurface Defects in Nd-doped Glasses
中文摘要	磷酸盐激光钕玻璃是高功率固体激光驱动装置中的激光增益介质，作为核心元件，钕玻璃平板的性能直接影响到激光系统的输出功率。随着激光系统输出功率的不断提高，对激光钕玻璃的抗激光损伤能力要求越来越高。但是在光学加工过程如研磨、抛光等过程中所产生的亚表面缺陷的极大限制了激光输出能量密度的进一步提高。对光学元件亚表面缺陷开展深入的研究，对于提高光学玻璃的激光损伤阈值具有重要的研究价值和学术意义。本论文主要研究掺钕磷酸盐中在研磨过程中所产生的亚表面为裂纹，通过显微荧光的方法来标记并暴露原本存在但是难以通过普通光学显微方法观测的微裂纹，开展了掺钕磷酸盐玻璃亚表面缺陷特征的研究。 论文首先在文献综述中介绍了亚表面缺陷的定义、产生机理以及形成。随后介绍了多种现有的亚表面缺陷检测手段。 论文第二章介绍了显微荧光法的实验方法和理论基础。针对具有多波段强吸收和发光特点的N31和N41型掺钕磷酸盐激光玻璃，选取罗丹明6G作为荧光标记物，它的激发和发光避开了钕离子吸收和发光。针对有机荧光素容易团聚的缺点，探索出了可以保持罗丹明6G荧光性能的溶剂。 论文第三章首先介绍了通过对样品同一区域进行光学显微成像、荧光成像以及荧光光谱分析来证明罗丹明6G显微荧光法对掺钕磷酸盐中亚表面缺陷探测的有效性。然后介绍了在不同磷酸盐样品中所观测到的多种典型亚表面缺陷。包括具有拖尾特征型、“轴向”型、“横向”型以及“放射”型。 论文第四章介绍了使用显微荧光法观测尖锐压头和钝形压头在掺钕磷酸盐玻璃中所产生的亚表面缺陷。对于尖锐压头，其产生的“横向”型裂纹较“轴向”型裂纹要深，在抛光过程中首先被去除。对于钝形压头，当法向压力较大时，除了具有拖尾特征的赫兹型裂纹，也会产生深度周期性变化的“轴向”型裂纹。 最后是本论文的结论部分，概括了全文的实验研究结果和创新点，同时指出了存在的不足的需要补充的改进之处。
英文摘要	Neodymium-doped phosphate laser glass has been widely used as amplifier in high-peak power lasers. As the key component, its quality greatly affects the useful output power of the laser system. The increase of the laser energy output requires much higher laser-induced damage (LID) resistance of Neodymium-doped phosphate glass. However, Subsurface defects (SSD) produced in the optical processes such as grinding and polishing can largely restrain the increment of laser energy output. It is of most research and academic importance to deeply investigate the SSD of optical components, which is propitious to increase the laser-induced damage threshold of optical glasses. This dissertation mainly studies the SSD that induced during the grinding process of Neodymium-doped phosphate glass. By revealing these defects which are invisible under conventional optical microscopy through Microscope Fluorescence method, we carried out the research of the characteristics of SSD in Neodymium-doped phosphate glass. First of all, the definition, formation mechanism of SSD were introduced in the literature summarizations. Then we introduced various SSD detection method that are currently used. In the second part, the experiment methods and theoretical foundation of Microscope Fluorescence method were introduced. For N31 and N41 Nd-doped phosphate glasses with strong multiband absorption and emission bands, Rhodamine 6G (R6G) is chosen as fluorescence label to tag subsurface defects in these glasses. As the excitation and emission bands of R6G are different from the emission and excitation bands of Neodymium-doped phosphate laser glass respectively. As an effort to overcome the aggregation of organic fluorescein, we developed a special solvent to maintain the concentration stability of R6G. In the third part, we firstly demonstrated the reliability of the method by analyzing the optical, fluorescence images and fluorescence spectrum of the same area in the sample. Then we introduced all kinds of subsurface defects observed in phosphate glasses, such as "Median" crack, "Lateral", "Star" crack, etc. In the fourth part, the SSD initiated by both sharp and blunt indenter in Neodymium-doped phosphate laser glass were presented. For sharp indenter, it will induce both "Median" and "Lateral" cracks, the latter ones are shallow and will be polished off firstly. For blunter indenter, not only "Partial Cone Cracks", but also "Median" cracks with depth fluctuation will be induced under sufficient high load. Finally, it was the conclusion of this dissertation, which generalized the innovative results of this dissertation and pointed out the drawbacks that needed to be improved.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16854]
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	王威. 使用显微荧光法探测钕玻璃中的亚表面缺陷[D]. 中国科学院上海光学精密机械研究所. 2014.

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