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题名	固体激光材料Ti3+:Al2O3, Re3+:Mixed Garnet, Re3+:CaYAlO4的生长及性能研究
作者	周大华
学位类别	博士
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	夏长泰
关键词	激光晶体，Ti3+:Al2O3光纤，Re3+:石榴石混晶, Re3+:CaYAlO4
其他题名	Growth and Spectral Research on Solid State Laser Materials: Ti3+:Al2O3, Re3+:Mixed Garnet, Re3+:CaYAlO4
中文摘要	激光晶体是一种重要的固体激光增益介质，常见的掺杂发光粒子包括过渡金属离子（如Ti3+，Cr3+）和稀土离子（如Nd3+，Yb3+），基质材料包括单晶、混晶和无序结构的晶体。为获得超短超快脉冲激光输出，要求发光中心较宽的荧光光谱，如钛宝石中三价钛离子便具有这一特征。而稀土离子由于其外层电子的屏蔽效应，内层自由电子吸收和荧光光谱较窄，往往选择混晶或无序晶体，以期通过无序的晶场导致稀土离子光谱加宽。为此，本论文分别研究了钛宝石、稀土离子掺杂石榴石混晶、以及稀土离子掺杂的铝酸钇钙无序晶体的生长、光谱及激光性能，主要工作及研究结果如下： 1. 分别利用提拉法和微下拉法生长多种掺杂蓝宝石晶体或光纤。分析了晶体生长中的气泡问题，测试了各种掺杂晶体或光纤的吸收光谱，荧光光谱，以及荧光寿命，拉曼光谱，尤其深入分析了其蓝光发光特征。 2. 提拉法生长了稀土离子掺杂石榴石混晶（Re3+:Mixed Garnet），包括Nd3+:Lu3ScAl4O12, Nd3+:Y2.5Gd0.5Al5O12, Er3+:Lu1.5Y1.5Al5O12 (Er:LuYAG), Ho3+:Lu1.5Y1.5Al5O12 (Ho:LuYAG)。研究了各晶体的结构、光谱、及激光性能。 3. 铝酸钇钙（CaYAlO4）晶体具有Ca2+和Y3+离子无序分布的结构特征。实验中测试了Er3+:CaYAlO4, Er3+-Yb3+:CaYAlO4晶体结构、偏正吸收、荧光、以及寿命特性。Ho3+:CaYAlO4及Tm3+-Ho3+:CaYAlO4晶体表现了较宽的吸收及荧光特征，并分析了Tm3+-Ho3+共掺晶体的上转换特征。铥光纤激光谐振泵浦下，最高得到Ho3+1.0%:CaYAlO4晶体2.38 W连续激光输出。
英文摘要	Laser crystal is one of the most important gain materials, in which transition metal ions (e.g. Ti3+, Cr3+ ) and rare earths ions (e.g. Nd3+, Yb3+) are the luminescence centers, and the host material are single, mixed, or disordered crystals. To get super short and superfast laser pulse, it is necessary for the luminescence centers to have a broad luminescence spectrum, such as the Ti3+ ions in sapphire. However, due to the shielding effect of electrons in outer shells, the luminescence spectra of Re3+ are always sharp. Therefore, one chooses mixed or disordered crystals as host material, expecting the disordered crystal field resulting Re3+ ions’ broad absorption and emission band. In this thesis, three kinds of materials are studied, as Ti3+:sapphire, Re3+:Mixed Garnet, and Re3+:CaYAlO4, including their growth, spectral characteristics, and laser operation. Parts of the research work and results are described as follows: 1. Ions-doped sapphire crystals and fibers have been grown by Czochralski or micro pulling down method. In addition, we analyzed the bubble distribution characteristics. At room temperature, the absorption and fluorescence spectra, lifetimes, and Raman shift have been investigate, especialy analyzed the blue emission charactris. 2. Rare earth doped mixed garnet crystals have been grown by Czochralski method, including Nd3+:Lu3ScAl4O12, Nd3+:Y2.5Gd0.5Al5O12, Er3+:Lu1.5Y1.5Al5O12 (Er:LuYAG), Ho3+:Lu1.5Y1.5Al5O12 (Ho:LuYAG). The crystals structure, spectral, and laser operation properties have been described in this thesis. 3. CaYAlO4 crystals have disordered structure, in which the Ca2+ and Y3+ ions distribute randomly. Research on Er3+:CaYAlO4, Er3+-Yb3+:CaYAlO4 crystals include their crystal structure, polarized absorption, fluorescence spectra and lifetimes. In addition, Ho3+:CaYAlO4 and Tm3+-Ho3+:CaYAlO4 crystals behave broad absorption and emission spectra, and the upconversion mechanics of Tm3+-Ho3+ have been analyzed. Pumped by Tm fiber laser, 2.38 W CW laser power was obtained with Ho3+1.0%:CaYAlO4 crystal.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/15862]
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	周大华. 固体激光材料Ti3+:Al2O3, Re3+:Mixed Garnet, Re3+:CaYAlO4的生长及性能研究[D]. 中国科学院上海光学精密机械研究所. 2014.

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