掺Er^3＋镓磷酸盐玻璃的光学性质

利用熔融淬火法制备了摩尔分数为40．8Ga2O3-58．0NaPO3-1．2Er2O3掺Er^3＋镓磷酸盐玻璃,测试并研究了样品中Er^3＋的吸收光谱、1．5μm发射光谱,根据Judd-Ofelt理论计算了Er^3＋离子强度参量Ωt（t=2,4,6）及自发辐射概率、荧光分支比、自发辐射寿命．结果表明,Er3＋1．5μm发射光谱半峰全宽达到40nm．同时,利用McCumber方法计算了Er^3＋4 I13／2→^4I15／2跃迁的受激发射截面,峰值达到6．10×10^-21cm^2,测定了Er^3＋4I13／2能级荧光寿命为4．88ms,^4I13／2能级量子效率为56．3％．     

掺钇球形Ni(OH)2的合成及高温性能研究

通过络合沉淀的方法制得了含钇的球形Ni(OH)2,研究了掺杂Y3 后的球形Ni(OH)2在不同温度下的充放电性能.试验结果表明:常温下含钇的球形Ni(OH)2的放电比容量比普通球形Ni(OH)2稍低,但随着温度的升高,它的放电比容量要比普通球形Ni(OH)2高很多,一般在25%以上.掺杂钇提高了球形Ni(OH)2的高温性能.     

冷拉拔工艺对稀土钼丝力学性能的影响

研究了冷拉拔过程对Mo—La2O3材料室温力学性能的影响及其机制。结果表明：适当的冷拉拔工艺可提高钼的室温强度；拉拔速度采用180m／win生产的稀土钼丝抗拉强度、抗弯折次数等指标均优于其它工艺速度的产品。微米级La2O3粒子均匀弥散在钼晶粒内部，通过钉扎位错，阻滞滑移系运动的作用，起到弥散强化效果。     

不同波长泵浦的掺铒Al2O3薄膜光波导 1．53 μm荧光特性

本文通过分析饵的能级结构,考虑了合作上转换、激发态吸收及交叉驰豫等上转换机制,给出了掺铒（Er^3 )Al2O3薄膜光波导1480nm、80nm和820nm3种泵浦波长下的速率方程,通过求稳态解,分析了3种波长泵浦时发射的1．53μm荧光特性以及合作上转换和激光态吸收对荧光的影响,结果表明利用980nm波长泵浦时可得到相对较强的1．53μm荧光,产浦强度时激发态吸收对荧光影响较大,而在高掺（Er^3 ）浓度时合作上转换占主导地位。     

气相火焰燃烧合成铁掺杂二氧化钛纳米晶及其结构性质研究

采用气相扩散火焰燃烧制备了铁掺杂二氧化钛纳米品,并利用XRD、EPR、ICP-AES和XPS等测试手段对该催化剂晶相组成、晶粒尺寸及表面性质进行了分析.研究表明,铁掺杂改性对制备TiO2的晶相组成及晶粒尺寸都会产生影响.随着掺入量的增加,掺杂相Fe3 逐渐向TiO2体相富集,并促进了TiO2表面氧空位的生成.     

Colloidal processing of Al2O3-doped zirconia ceramics with CaO–P2O5–SiO2 glass as additive

Well-dispersed concentrated aqueous suspensions of Al₂O₃-doped Y-TZP (AY-TZP), AY-TZP with 5.4 vol% of CaO–P₂O₅–SiO₂ (CaPSi) glass (AY-TZP5) and 10.5 vol% CaPSi glass (AY-TZP10), with ammonium polyacrylate (NH₄PA) dispersant were prepared to produce slip cast compacts. The rheological properties of 35 and 40 vol% slips were studied. The densification, microstructure as well as hardness and fracture toughness were investigated as a function of CaPSi glass content at 1300°C-1500°C. The optimum NH₄PA concentration of 35 vol% AY-TZP5 and AY-TZP10 slips at pH ~9 was found to be about 43% and 67% greater than that of AY-TZP slips; this behavior was related to the greater amounts of Ca²⁺ ions leached out from the CaPSi glass surface. The viscosity of stabilized 40 vol% slips with NH₄PA attained a minimum value at 5.4 vol% CaPSi glass addition, and resulted in a more dense packing of cast samples. AY-TZP5 can be sintered at a lower temperature (1300°C) compared to that of AY-TZP. AY-TZP5 exhibited a fine microstructure of tetragonal ZrO₂ (grain sizes below 0.3 µm), and ZrSiO₄–Ca₂P₂O₇ particles homogeneously distributed within the zirconia matrix. It presented similar fracture toughness and a slightly lower hardness compared to those of AY-TZP.     

2μm高功率掺铥光纤激光器研究进展及其应用

2μm掺铥光纤(TDF)激光器在遥感、激光雷达、探测、医疗、光学参量振荡等方面有着重要的应用,近年来得到了快速的发展,目前已实现千瓦级的激光输出。主要介绍了掺铥光纤激光器的基本原理,以及近年来国内外的研究进展与应用。最后对掺铥光纤激光器的发展进行展望。     

Deposition and photoluminescence of sol–gel derived Tb:Zn2SiO4 films on SiO2/Si

Tb³⁺ doped Zn₂SiO₄ films have been deposited on SiO₂ buffered Si wafers by sol–gel method. The structures of these films have been investigated with X-ray diffraction (XRD), atomic force microscopy (AFM), and scanning electron microscopy (SEM). The results revealed that these films were composed of nanometer-size grains with a Willemite structure and had smooth surfaces. Photoluminescence measurements of the films showed a strong emission from ⁵D₄ to ⁷F₅ at 544 nm. The blue emission from ⁵D₃–⁷F_j was depressed because of cross-relaxation effect. The decay kinetics of the ⁵D₄–⁷F₅ green emission was studied and a best fitting was obtained by a double exponential function. The lifetime of the excited ⁵D₄ state is estimated to be 5.2 ms.