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掺铒TeO2-Nb2O5-ZnO系统玻璃的上转换发光性能 总被引:1,自引:0,他引:1
稀土离子掺杂碲酸盐系统玻璃是一类应用前景良好的上转换发光材料.研究了含铒TeO2-Nb2O5-ZnO系统玻璃在980nm抽运下的上转换光谱,结果发现存在3个上转换荧光谱带,分别对应于2H11/2→4I15/2、4S3/2→4I15/2和4F9/2→4I15/2,而且Er3 含量的增加可明显提高材料在530、550和660nm附近的发光性能.少量的ZnO引入既可以大幅提升材料的上转换发光强度,又能保持铌碲酸盐玻璃良好的化学稳定性.材料的发光机制主要是激发态吸收(ESA)和能量转移(ET),最大声子能量的降低是上转换发光增强的主要原因. 相似文献
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碲酸盐玻璃具有较高的二阶、三阶非线性极化率、高折射率、宽红外透过范围、低熔点温度和高介电常数等特性,因此被认为是光学和通讯系统中一种理想的材料,在非线性光学器件方面有很好的应用前景.比如,它具有较高的三阶光学非线性系数,因而被广泛应用于超快全光学开关器件.最近,一些重金属氧化物和稀土金属氧化物掺杂在碲酸盐玻璃 相似文献
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ZnO对碲铌基重金属氧化物玻璃的结构和光学性能的影响 总被引:4,自引:0,他引:4
TeO2 Nb2O5系统重金属氧化物玻璃是一种新型的重金属氧化物玻璃材料,具有优良的非线性光学性能。本文研究了ZnO对碲铌基玻璃的结构、非线性光学性能和光学透过率的影响,研究表明:碲铌基玻璃的非线性光学效应源于电子云畸变效应,掺杂少量ZnO有利于玻璃非线性光学性能的提高,增加ZnO至2.5%(质量分数)时用四波混频法测得的玻璃三阶非线性极化率χ(3)可达9.2×10-13esu,然后随ZnO含量增至10%(质量分数)时χ(3)减至6.0×10-13esu。ZnO含量在10%~15%(质量分数)时χ(3)则无明显变化。同时,加入15%(质量分数)的ZnO有利于玻璃透过率的提高。Raman光谱研究表明,掺入过多的ZnO(>5%(质量分数))时,网络间隙中的Nb5+可被Zn2+取代而进入网络,同时提供更多的桥氧,从而使玻璃网络中的[TeO4]4-基团向[TeO3]2-转化。 相似文献
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The relationships between two-photon absorption (TPA) effect and excited state intramolecular charge transfer (ICT) of p-substituted stilbene-type pyridinium salts have been investigated. Two-photon absorption cross section (δTPA) for all the compounds has been determined by open aperture Z-scanning technique, while two-photon pumped (TPP) up-converted lasing efficiencies (η) and optical limiting behavior have been measured by two-channel energy-meter, pumped by a mode locked Nd: YAG ps laser. Streak camera was used to record two-photon induced fluorescence and the fluorescence lifetimes. The experimental and calculated results have shown that the excited state larger in-tra-molecular charge transfer, in the excited state characterized by the charge density difference between the ground state ( S0) and the first excited state ( S1), has contributed to enhancing TPA cross section and may result in better optical limiting effect. And high TPP up-converted lasing efficiency is related to not only the δTP 相似文献
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量子干涉效应是当前量子光学研究的热点之一.基于量子干涉效应的新观象(如相干粒子数捕获(CPT)、电磁感应透明(EIT)、无反转激光(LWT)以及自发辐射修正(MSE)等引起了物理学界的广泛关注.深入研究量子干涉效应具有重要的学术意义和明显的潜在应用前景.对激光物理学、激光光谱学、原子分子物理学及相关的高技术的发展将产生深远的影响. 目前,量子干涉效应及其相关现象的研究主要涉及简单的二能级或A、V、E型三能级系统,且限于原子样品,而量子干涉效应及其相关现象要得到真正应用的体系则非常复杂,这些体系包… 相似文献
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The nonlinear absorption properties of Er^3+ doped telluride glass were investigated with picosecond laser pulses. The optical limiting response was measured with a transmission technique and reverse saturable absorption (RSA) with a Z-scan technique, which proved that the glass was a promising material for practical optical limiters. The experimental resulted showed that the excited absorption was responsible for the measured RSA, resulting in the optical limiting response. The measured data could be well simulated with a rate equation model to obtain the absorption cross sections of the excited state. 相似文献