Nd:LuAG和Nd:LuxY3-xAl5O12透明陶瓷的制备及光学性能研究
文献类型：学位论文
| 作者 | 张阳 |
| 学位类别 | 硕士 |
| 答辩日期 | 2015 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 姜本学 |
| 关键词 | Nd:LuAG，透明陶瓷，激光，J-O理论 |
| 其他题名 | Preparation and optical properties of Nd:LuAG and Nd:LuxY3-xAl5O12 transparent ceramics |
| 中文摘要 | 镥铝石榴石（Lu3Al5O12，简称LuAG）具有优异的光学性质和热力学性能，是一种优秀的光学功能材料，它属于立方晶系，无双折射效应，热导率高，稳定性好；掺入激活离子后还是优秀的激光材料，尤其是掺入Nd3+稀土离子后发射截面适中，是面向ICF应用实现高功率激光输出的理想增益介质材料。但是由于LuAG单晶熔点高导致制作成本很高，生长单晶尺寸也受到很大限制。相对于单晶而言，透明激光陶瓷因为制备周期短、生产成本低，而且易获得大尺寸、掺杂浓度高、光学均匀性好的样品，因此成为近年来材料领域的一个研究热点。 基于此，本论文分别研究了使用真空烧结一步法和真空烧结+热等静压烧结两步法合成Nd:LuAG透明陶瓷的工艺，对Nd:LuAG透明陶瓷的微观结构和激光性能进行了研究。并运用Judd-Ofelt (J-O) 理论对Nd:LuxY3-xAl5O12系列材料的光学参数进行了系统的表征。 1．Nd:LuAG透明陶瓷的制备 分别采用真空烧结法和真空烧结+热等静压烧结两步法合成了Nd:LuAG透明陶瓷。对于真空烧结法，系统研究了烧结助剂配比、球磨时间、烧结温度、保温时间、退火温度等因素对陶瓷光学质量的影响规律，并确定了各个工艺条件的最佳值。对于真空烧结+热等静压烧结两步法，深入研究了真空预烧结后样品状态对热等静压处理的影响，并对两步法制得的样品退火机理进行了深入的研究。 2．Nd:LuAG透明陶瓷的光学性能 在常温下分别对Nd:LuAG透明陶瓷的吸收、发射光谱进行了测试，使用二极管泵浦激光器为泵浦原以Nd:LuAG透明陶瓷为增益介质开展了激光实验，进行了连续光和光电调Q激光实验，连续光输出功率达到了2.5W，对应的光光转换效率为17.2%，斜率效率为24.3%，对于光电调Q激光实验，最短脉冲宽度和最大脉冲能量分别为4.8ns，1.96mJ，光光转换效率为17.3%，斜率效率为28.7%。 3．Nd:LuxY3-xAl5O12系列材料光学参数计算 使用真空烧结法合成Nd:LuxY3-xAl5O12系列透明陶瓷材料，运用Judd-Ofelt (J-O) 理论对Nd:LuxY3-xAl5O12系列材料荧光分支比、辐射寿命、受激发射截面等参数进行了系统的计算分析，并探索随着x值的变化材料光学性能变化规律。 |
| 英文摘要 | Lutetium aluminum garnet (Lu3Al5O12, LuAG) is an excellent optical functional material with outstanding optical and thermo-mechanical properties, such as high thermal conductivity, excellent thermal stability, and it belongs to cubic system with no birefringence effect. Active ions doped LuAG can also be used as excellent laser materials. It can generate different wavelength laser with corresponding ions. Furthermore, the fluorescence emission cross section of Nd3+ doped LuAG material is between 2x10-20 and 10x10-20cm2. This is very important for inertial confinement fusion(ICF) application. However, high melting point of LuAG result in the processing of single crystal very complex, it need not only much time but also an expensive Ir crucible. Furthermore, it’s hard to reach large size single crystal. Compared with single crystals, transparent laser ceramics have attracted more attention because of their ease of manufacture, low cost, high doping concentration and good optical homogeneity, and so on. In this dissertation, Nd:LuAG polycrystalline ceramics were synthesized via vacuum sintering and vacuum sintering plus hot isostatic pressing sintering methods. The microstructure and laser performance of Nd:LuAG were also investigated. Besides, The spectral parameters of Nd:LuxY3-xAl5O12 series were calculated based on Judd-Ofelt (J-O) theory. 1．The preparation of Nd: LuAG ceramics In this experiment, vacuum sintering and vacuum sintering plus hot isostatic pressing (HIP) sintering methods were uesd to synthesize Nd: LuAG ceramics. For vacuum sintering method, the influence of ratio of sintering additives, ball grinding time, sintering temperature, holding time and annealing temperature were studied systematic. For vacuum sintering plus hot isostatic pressing sintering method, we study the status effect of Nd: LuAG ceramics which treated by vacuum sintering on hot isostatic pressing sintering process. We also further research the annealing process mechanism of samples treated by HIP. 2．The laser properties of Nd: LuAG ceramics The absorption, fluorescence spectra and fluorescence decay curve of Nd:LuAG transparent ceramic were investigated at room temperature. A diode-end-pumped Nd:Lu3Al5O12(LuAG) ceramic laser was demonstrated. We present experiment results of continuous wave (CW) and electro-optically (E-O) Q-switched performances of Nd:LuAG transparent ceramic laser. CW output power of 2.5 W was obtained, corresponding to optical conversion efficiency of 17.2% and slope efficiency of 24.3%. For the E-O Q-switched, the shortest pulse width and the largest pulse energy were measured to be 4.8 ns and 1.96mJ. Its optical-to-optical efficiency and the slope efficiency were 17.3% and 28.7%, respectively. 3．Spectroscopic properties of Nd:LuxY3-xAl5O12 series ceramics The Nd:LuxY3-xAl5O12 series transparant ceramics have been synthesised by vacuum sintering method. The spectral parameters such as branching ratios, radiative lifetime, and emission cross-section were calculated based on J-O theory. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16880]  |
| 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 | 张阳. Nd:LuAG和Nd:LuxY3-xAl5O12透明陶瓷的制备及光学性能研究[D]. 中国科学院上海光学精密机械研究所. 2015. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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