共查询到19条相似文献,搜索用时 234 毫秒
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YCOB晶体生长与激光倍频性能研究 总被引:2,自引:0,他引:2
坩埚下降法沿<010>和<001>方向生长了直径达到25mm的完整透明的Ca4YO(BO3)3 (YCOB)晶体.化学腐蚀结果表明,所生长晶体无孪晶或亚晶界等缺陷,晶体尾部的位错密度 不超过1800/cm2测量了YCOB的透射光谱,其截止波长为200nm进行了YCOB晶体对 Nd:YAG激光的二次倍频实验.通过与KDP晶体对比,计算出YCOB晶体的有效非线性系数 在Ⅰ型相位匹配方向(θ,φ)=(66.3°,143.5°)和(65.9°,36.5°)上分别为1.45pm/V和0.91pm/V; 大于KDP和 LBO晶体.在脉冲宽度10ns的 Nd:YAG激光单脉冲辐射下YCOB晶体出现体 损伤的激光损伤阈值不低于85GW/cm2. 相似文献
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掺镁PbWO4晶体的生长及其闪烁性能研究 总被引:1,自引:0,他引:1
用Czochralski法生长了掺镁PbWO4晶体,测试了Mg:PbWO4晶体的透射光谱、激发发射光谱、发光效率和衰减时间。Mg:PbWO4晶体的秀经和发光效率高于PbWO4晶体。 相似文献
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在PbWO4晶体中掺进La2O3生长La:PbWO4晶体。测试La:PbWO4晶休的透射光谱、激光发射光谱、发光效率、衰减时间和辐射硬度。La:PbWO4晶体的透过率增大,峰位发生红移,发光效率增加一倍,较大幅度提高抗辐照损伤能力。 相似文献
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报道了在PbWO4晶体中掺进Ta2O5生长Ta:PbWO4晶体的研究结果。测定了核晶体的透过率、发光效率和抗辐照损伤能力,研究和探讨了Ta:PbWO4晶体闪烁性能增强的机理。 相似文献
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报道了用改进的Bridgmam法生长的大尺寸PbWO4:(Sb,Y)晶体的光谱特性的表征研究.通过对依次切自大尺寸PbWO4:(Sb,Y)毛坯晶体的籽晶端、中间部位和顶端三块晶体(-23mm×23mm×20mm)的透射光谱、X射线激发发射光谱、紫外激发与发射光谱、发光衰减寿命、光产额和辐照损伤等方面的光谱性能测试,结果表明,Sb、Y双掺杂能显著改善PbWO4晶体的光谱性能,使晶体在短波330-420nm范围的透过率明显提高,光产额增加,抗辐照能力增强.但从籽晶端到顶端的性能存在一定的差异,说明大尺寸的PbWO4:(Sb,Y)晶体的均匀性还有待提高. 相似文献
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S. Suma N. Santha M. T. Sebastian 《Journal of Materials Science: Materials in Electronics》1998,9(1):39-42
Single crystals of the non-linear optical material KTiOPO4 (KTP) have been grown using a new KBa2(PO3)5?2K2O flux, which produced faster growth than existing fluxes. Crystals of size 6 mm×4 mm×2 mm were grown from the flux in a day. Perhaps relatively large crystals may be grown commercially in a short time. 相似文献
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《Optical Materials》2007,29(12):1385-1388
The PbWO4 nano- and macroparticles with uniform size and shape have been synthesized via a wet chemical process in the presence of surfactant. The products were characterized by the techniques of X-ray diffraction (XRD) and transmission electron microscopy (TEM). Experiment results indicated that the surfactant poly(vinylpyrrolidone K30) (PVP) played a key role in the formation of the rhombic-shaped PbWO4 macroparticles. A growth mechanism contributed to the formation of the well-fined PbWO4 macroparticles was proposed. The luminescence properties of PbWO4 nano- and macrostructure were investigated. 相似文献
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A new flexible approach is developed to synthesize PbWO4 nanoparticles inside the channels of mesoporous silica SBA-15. Mesoporous SBA-15 silica with 7 nm pores was produced by a hydrothermal process and used as a hard template. PbWO4 nanoparticles were synthesized and incorporated into the mesoporous silicate support in a low-power ultrasonication condition. The as-synthesized samples were characterized by Raman spectroscopy, diffuse reflectance UV–vis spectroscopy (UV–vis), powder X-ray diffraction (XRD), small-angle X-ray diffraction (SAXRD), nitrogen adsorption and transmission electron microscopy (TEM). It was found that PbWO4 nanoparticles appeared among the channels of SBA-15. Blue shift was observed in UV–vis absorption spectra due to the quantum size effect of PbWO4 nanoparticles. This preparation method is also capable of synthesis of various semiconductor nanoparticles with controlled size and morphology inside the channels of mesoporous materials. 相似文献
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V. T. Kalinnikov O. G. Gromov A. P. Kuz’min G. B. Kunshina E. P. Lokshin Yu. A. Savel’ev S. F. Burachas 《Inorganic Materials》2006,42(5):543-549
We have developed liquid-phase and solid-state processes for the preparation of tetragonal lead tungstate powder with the stoichiometric PbO: WO3 ratio. Solid-state synthesis has been shown to have a number of significant advantages over the liquid-phase process. In addition, a procedure has been developed for processing PbWO4 crystal growth waste through PbWO4 decomposition in nitric acid, which ensures the preparation of extrapure-grade WO3 and PbO. The WO3 and PbO thus obtained have been used in solid-state synthesis of PbWO4, from which high-quality crystals have been grown. 相似文献
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利用熔体提拉法生长了大尺寸,高质量的新型激光自倍频晶体Nd:GdxY1-x(Ca4O(BO3)3(简称Nd:GdYCOB),对Nd:GdYCOB晶体的XRD衍射图进行指标化,得到它的晶胞参数为a=8.080A;b=16.016A;c=3.538A,β=101.18,μ=491.1A3,对取自不同部位的晶体粉末进行ICP原子发射光 分析表明晶体整体组份均匀一致,根据熔体和晶体粉末的ICP数据计算,Nd:GdYCOB晶体中Nd3 的分凝系数为0.63,首次报道了Nd:GdYCOB晶体200-3000nm室温透过光谱和室温荧光光谱及荧光寿命,室温透过光谱表明Nd:GdYCOB晶体的紫外吸收边在-220nm,具有很宽的透光波段(-220-2700nm);Nd:GdYCOB晶体在800nm附近存在很强的吸收,适合于LD泵汪,为光光谱表明Nd:GdYCOB晶体是一种很有潜力的RGB(red,green,blue)激光自倍频晶体,掺杂4%,5% Nd:GdYCOB晶体的荧光寿命分别为105us和100us。 相似文献
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采用热键合技术制备了Yb:Y3Al5O12/Y3Al5O12(Yb:YAG/YAG)复合晶体,对复合晶体进行了结构表征和键合质量检测.利用光学显微镜和扫描电镜观察了复合晶体横截面的形貌;在偏光显微镜下观察键合区域的应力,利用干涉条纹来表征复合晶体的光学均匀性;通过红外透过光谱的测量来检测复合晶体的键合质量.实验结果表明:热键合技术制备的Yb:YAG/YAG复合晶体键合界面处无界面缺陷,不存在复合界面空间过渡层,光学均匀性良好. 相似文献