Y共掺对掺Er硅酸盐玻璃光致荧光及荧光寿命的影响

采用固相反应方法制备了Er/Y共掺激光玻璃，其中Er³⁺浓度分别为0.5at%和1.0at%，所对应的Y³⁺浓度的变化范围分别为0.0at%—2.5at%和0.0at%—5.0at%.通过吸收光谱、瞬态和稳态光致发光光谱测量，研究了Y共掺对Er³⁺吸收截面、发射截面、荧光寿命和光致荧光特征的影响.研究结果表明：Y共掺杂导致1530nm附近的吸收峰宽化，对Er³⁺的吸收起到了一定的增强作用，并且这种宽化作用随着Er关键词： Er/Y共掺玻璃 光致荧光 荧光寿命     

掺Er磷酸盐玻璃中红外发光特性研究

报道了一种最新型可用于1．5μm光纤通信传输介质的掺Er^3 的磷酸盐玻璃,通过对其吸收谱的测量,可看到在970nm附近有一很强的吸收峰,适合于采用LD激光泵浦。我们在发射波长为970nm的半导体激光器激发下测量了这种材料的发射谱,观察到在红外波段1540nm处在强发射峰。我们从吸收谱出发拟合出了J－O强度参数,进而计算出了Er^3 离子各相关跃迁的理论振子强度、实验振子强度及自发辐射系数,从结果可得出理论和实验是相符的。     

Er/Yb共掺硅酸盐玻璃的光致发光

采用固相反应方法，制备了Er³⁺离子浓度为0.5 at.%，Yb掺杂浓度范围为0.0— 6.0 at.%的Er/Yb共掺激光玻璃，并对激光玻璃的吸收光谱和光致荧光光谱进行了分析.研究 结果显示，Yb³⁺掺杂对Er³⁺在980 nm附近的吸收起到了非常显著的 增强作用.在 980 nm的激光抽运下，激光玻璃在1530 nm处的光致发光强度随着Yb离子浓度 的增加而先增大后减小， 当Yb³⁺离子浓度为Er³⁺离子浓度6倍时光 致发光强度达到最大值.同时还发现了Yb³⁺对Er³⁺的光致荧光光谱 的展宽作用，并讨论了荧光光谱的展宽机理. 关键词： Er/Yb共掺玻璃 光致发光 吸收光谱     

掺Bi石英光纤的γ射线辐照和温度影响特性

采用改进的化学气相沉积法制备了尺寸为10/130 μm的掺Bi单包层石英光纤, 把光纤分成若干组之后置于不同剂量的⁶⁰Co γ辐射源下辐照, 测试了光纤在辐照前后的吸收谱和荧光谱, 并测试了光纤在全温度范围(-40–70 ℃)下荧光强度的变化. 实验结果表明, 辐照后700, 800 nm处的吸收峰显著增强, 这是由于辐照导致更多Bi 近红外活性中心的生成. 976 nm光抽运不同剂量辐照后的光纤, 中心位于1230 nm的荧光谱没有明显变化, 验证了掺Bi石英光纤用于太空及辐照环境下光通信的可能性. 在全温度范围内, 分析了荧光强度的变化规律, 为今后掺Bi光纤激光器的稳定工作提供了数据基础.     

掺Er凝胶玻璃中Er离子发光性质的研究

用溶胶－凝胶方法合成了掺铒的二氧化硅玻璃。在室温下可产生１．５４μｍ波长的红外荧光。实验结果表明：荧光强度随掺杂浓度的不同而改变，并在０．５Ｗ％的掺杂浓度下出现最大值。当温度从４Ｋ升至３００Ｋ时，荧光强度下降了７４％。     

γ辐照后硼硅酸盐玻璃的吸收光谱研究

玻璃固化体是用来固化放射性废物的硅酸盐。作为放射性废物处理的第一道工程屏障,它的耐辐照性能尤其引人注目。本工作使用硼硅酸盐玻璃模拟玻璃固化体材料,用不同剂量的γ射线辐照硼硅酸盐玻璃模拟天然放射性对固化体的辐照损伤。通过测量和分析辐照后硼硅酸盐玻璃的吸收光谱,证实了辐照后在玻璃中产生了E'缺陷,非桥氧空位色心、过氧自由基以及过桥氧联接等缺陷。此外,还得出了不同微观结构随吸收剂量的演化关系。对于辐照后产生的缺陷,它们的浓度都随吸收剂量的增加而增大。同时,发现玻璃在辐照后其吸收光谱的带隙随着剂量的增加而逐渐变窄;而当吸收剂量大于等于105 Gy时,玻璃的带隙则达到饱和值。Vitrification is one kind of silicates which is used for immobilization of high-level waste (HLW). As the first engineered barrier of HLW disposition, its anti-irradiation characteristic is particularly noticeable. Vitrification is replaced by borosilicate glass to investigate radiation effect, and the irradiation damage generated by natural radioactivity in vitrification is simulated by different doses gamma rays on borosilicate glass. By measuring and analyzing the absorption spectrum of irradiated borosilicate glasses, it is confirmed that E'defect, non-bridging oxygen hole center, peroxy dangling bond and bridge oxygen link, etc. are induced in borosilicate glass after irradiation. Furthermore, the relations between the defects and absorbed doses are shown. For the concentrations of these defects induced by irradiation, all of them increase with absorbed dose. Meanwhile, absorption band gap in borosilicate glass after irradiation decreases with absorbed dose and the band gap becomes saturated when absorbed dose is equal to or greater than 105 Gy.     

掺铒、镱铒共掺硅酸盐玻璃1.54μm荧光寿命测量

对自制的掺铒、镱铒共掺硅酸盐玻璃1.54μm荧光寿命进行了测量。实验结果表明:荧光衰减曲线是一条单指数曲线,与理论分析相一致,荧光寿命数量级为ms量级;在所考虑的泵浦功率范围内,两种样品的荧光寿命基本不随功率的变化而变化;荧光寿命随着样品掺铒浓度的增加呈现减小趋势,而在掺铒浓度一定的情况下随掺镱浓度的变化不明显,主要由于受激发的铒离子把能量通过间接耦合给了猝灭中心。     

掺Er3+钆硼硅酸盐玻璃及玻璃陶瓷的红外发光特性和热稳定性

报道了一种新型可作为掺铒光纤放大器(EDFA)基质材料的Er³⁺掺杂B₂O₃-SiO₂-Gd₂O₃-Na₂O(BSGN)体系玻璃及其玻璃陶瓷。对材料中铒的⁴I_13/2→⁴I_15/2跃迁的1.5μm发射光谱、吸收光谱、时间分辨光谱及寿命进行了测量和分析,讨论了热处理对玻璃材料带宽和寿命的影响。结果表明,铒掺杂玻璃1.5μm发射的带宽和J-O参数Ω₆都随B₂O₃含量的增加而增加,寿命随B₂O₃含量的增加而减小。经过热处理后得到的玻璃陶瓷比具有相同组分的玻璃具有更高的1.5μm发射效率。同时,差热分析的数据表明,该玻璃体系具有极好的热稳定性。     

伽马辐照对掺镱光纤材料特性影响的研究

掺镱光纤是高功率激光器的核心材料,但在高能射线辐照后其应用性能会显著下降,因此有必要对掺镱光纤材料在辐照环境下的性能变化进行深入研究。采用改进型化学气相沉积法结合稀土螯合物掺杂制备了系列光纤预制棒及光纤,测试了光纤在不同剂量下射线辐照前后的高功率输出性能,以及光纤预制棒辐照前后的吸收光谱及镱离子荧光寿命。结果表明：小剂量辐照后掺镱光纤的高功率输出显著下降,通过预制棒吸收光谱可看出主要是因为伽马辐照后使掺镱光纤材料中Al的相关缺陷浓度增多,在可见光区域吸收损耗增加。Ce离子的掺杂通过缓减辐致铝氧空位中心（Al-OHC）色心缺陷的增加,减少Yb离子荧光寿命的下降,可在一定程度上抑制高功率掺镱光纤的辐致暗化。     

电子辐照对掺铒单模光纤损耗特性的影响

本文介绍了掺铒(Er³⁺)单模光纤电子辐照特性,测量了辐照前后和退火后的光纤参数。发现在0.80-1.60μm范围内辐照引起的损耗很大,在0.80-1.20μm短波部分辐照损耗遵循L_UV=0.342exp[E/0.166];而1.20-1.60μm长波部分遵循L_IR=2.2·10⁴exp[-6.08E](E的单位为eV)。120℃退火60h可使长波辐照损耗减少,但0.80μm附近的损耗反而增加。最后讨论了辐照损耗的机理 关键词：     

Spectral properties of erbium-doped heavy metal oxyfluoride silicate glasses for broadband amplification

Erbium-doped glasses showing a wide 1.55μm emission band are reported in a novel heavy metal oxyfluoride glass system SiO_2－PbO－PbF_2 and their optical properties such as emission spectra, fluorescence lifetime and the refractive index have been investigated. The broad and flat {}^4I_{13/2}→{}^4I_{15/2} emission of Er^{3+} ions around 1.55μm can be used as host materials for potential optical amplifiers in wavelength-division-multiplexing network system. We find that with increasing PbF_2 content in the glass composition, the fluorescence full width at half maximum and fluorescence lifetime of the {}^4I_{13/2} level of Er^{3+} increase, while refractive index and density decrease.     

Radiation-induced effects in soda-lime silicate glasses of different origin

Abstract

Correlated measurements of optical absorption and thermoluminescence of γ-irradiated soda-lime silicate (SLS) glasses were performed to detect and characterize the induced radiation damage in these materials. Three kinds of hole-type defect centers have been distinguished in glasses which differ with respect to the content of the glass-network modifiers and some multivalent transient metal cations. The main features of the related absorption bands are compared and discussed in terms of the purity and pre-irradiation history of samples.     

荧光捕获效应对Yb3+磷酸盐玻璃光谱性质的影响

测试了不同掺杂浓度和不同厚度下Yb3+ 磷酸盐玻璃的吸收光谱、荧光光谱和荧光寿命 ,计算了积分吸收截面、吸收截面、受激发射截面、自发辐射寿命以及荧光有效线宽等光谱参数 ,讨论了荧光俘获效应对Yb3+ 磷酸盐玻璃光谱性质的影响 .结果表明荧光俘获效应随样品厚度和掺杂浓度的增加而增大 .由于荧光俘获效应的存在使得测量的Yb3+ 磷酸盐玻璃荧光寿命明显长于计算的荧光寿命 ,在 0 2mol%Yb2 O3低掺杂浓度下采用不同厚度 ( <4mm)的样品测量的荧光寿命之间误差为 3 0 %左右 ,高浓度 ( 6mol%Yb2 O3)掺杂下误差可达 43 % .荧光俘获还造成荧光谱线加宽 ,导致荧光有效线宽在低浓度 ( 0 2mol%Yb2 O3)时增加 14% ,在高掺杂浓度 ( 6mol%Yb2 O3)下增加 3 0 %以上     

荧光捕获效应对Yb3+磷酸盐玻璃光谱性质的影响

测试了不同掺杂浓度和不同厚度下Yb³⁺磷酸盐玻璃的吸收光谱、荧光光谱和荧 光寿命，计算了积分吸收截面、吸收截面、受激发射截面、自发辐射寿命以及荧光有效线宽等光谱参数，讨论了荧光俘获效应对Yb³⁺磷酸盐玻璃光谱性质的影响.结果表明荧光俘 获效应随样品厚度和掺杂浓度的增加而增大.由于荧光俘获效应的存在使得测量的Yb^{3+磷酸盐玻璃荧光寿命明显长于计算的荧光寿命，在0.2mol%Yb₂O₃低掺 杂浓度下 关键词： 荧光俘获 掺镱磷酸盐玻璃 荧光光谱}     

Li~+对Tb~(3+)掺杂硅酸盐玻璃闪烁性能的影响

利用高温熔融法制备了Li+掺杂Tb3+激活硅酸盐闪烁玻璃。通过Li+掺杂Tb3+激活硅酸盐玻璃的紫外可见透射光谱、发射光谱和发光衰减时间谱,研究了Li+的加入对Tb3+掺杂硅酸盐玻璃发光性能的影响。结果表明:适量Li+的加入可有效增强Tb3+激活硅酸盐玻璃的发光强度,且相比于不掺杂Li+的Tb3+掺杂硅酸盐玻璃而言,当掺入质量分数为2.0%的Li+时,Tb3+在玻璃中的最佳掺杂质量分数由12.8%提高至15.3%。其原因是Li+掺杂增加了玻璃体系中非桥氧的数量,从而有利于改善Tb3+在玻璃体中的均匀性,降低Tb3+间因非辐射跃迁而引起的能量损失,以及提高Tb3+的最佳掺杂质量分数。但当掺入Li+的质量分数超过2.0%时,会对Tb3+激活硅酸盐玻璃的闪烁光强产生负面影响,这是因为过多的非桥氧阻碍了X射线激发能达到Tb3+离子的能量传递。     

荧光俘获效应对掺饵氧化物玻璃光谱性质的影响

测试了不同掺杂浓度和样品厚度下掺铒磷酸盐和碲酸盐玻璃的吸收光谱、荧光光谱和荧光寿 命，计算了Er³⁺离子在1.53 μm处的吸收截面(σ_a)、发射截面(σ _e)、自发辐射跃迁概率(A_rad)、辐射跃迁寿命(τ_rad) 、以及辐射跃迁量子效率(η)等光谱参数.讨论了荧光俘获效应对掺铒磷酸盐和碲酸盐玻璃 光谱性质及光谱参数的影响.结果表明即使在铒离子低掺杂浓度(0.1 mol% Er₂O ₃)下，荧光俘获效应也普遍存在于掺铒玻璃材料中，使得荧光寿命(τ_{f)和荧光半高宽(FWHM)随样品的厚度和铒离子掺杂浓度增加而增大，导致碲酸盐和磷酸 盐玻璃中τf分别增加11%—37％和6%—17%，FWHM分别增加15%—64%和11%—55% ，使得掺铒玻璃材料的放大品性参数(σe×FWHM) 也相应被估高.由于铒离子在 碲酸盐玻璃中在1.53 μm处吸收和发射截面重叠面积较大，加之铒离子在前者基质中的发射 截面高于后者，使得掺铒碲酸盐玻璃中的荧光俘获效应高于磷酸盐玻璃. 关键词： 荧光俘获 铒离子 碲酸盐玻璃 磷酸盐玻璃}     

Quantitative Raman spectroscopy: speciation of cesium silicate glasses

The silicate speciation forms an important aspect of the structure of silicate melts, a subject of interest to both the earth‐ and materials science communities. In this study, the Qⁿ speciation of binary cesium silicate glasses was studied by Raman spectroscopy. A method to extract the equilibrium constant from a set of Raman spectra is presented, and the least‐squares optimization algorithm is given (in Supporting Information). Log(K), the equilibrium constant of the speciation reaction, 2Q³ = Q⁴ + Q², equals −2.72 ± 0.11 at the glass transition. This extends the previously established correlation between log(K) and the inverse of the ionic radius of the network modifier to cesium. Copyright © 2009 John Wiley & Sons, Ltd.     

Saturated absorption and nonlinear refraction of silicate glasses doped with silver nanoparticles at 532 nm

The nonlinear optical characteristics of silicate glasses doped with silver nanoparticles are investigated by Z-scan technique using second harmonic radiation of picosecond Nd:YAG laser (=532 nm, =55 ps). The real and imaginary parts of third-order nonlinear susceptibility of silver-contained glasses were measured. It was found that the sign of Im ⁽³⁾was negative due to saturated absorption and the sign of Re ⁽³⁾ was changed from negative (self-defocusing) to positive (self-focusing) with growth of laser radiation intensity. The mechanisms responsible for saturated absorption and nonlinear refraction are discussed.     

Optical properties of Ce–Ti-containing silicate glasses

Silicate glasses doped with ceria and titania have been studied. Such co-doping determines the specific coloration of the glasses with adjustable absorption in the visible spectral region. Based on measurements of optical transmittance and photoluminescence and studies of electron paramagnetic resonance, it was established that the features of their optical properties are due to the formation of chromophore centers incorporating cerium and titanium ions. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 2, pp. 202–208, March–April, 2009.