Tm3+掺杂锗铌酸盐玻璃及其红外光谱特性

用高温熔融法制备了相同质量百分比浓度4%Tm₂O₃掺杂浓度下(90-x)GeO₂-xNb₂O₅-10Na₂O(其中数字为摩尔百分比x=1,2,4,6,8)以及Tm₂O₃掺杂浓度分别为质量百分比1%,2%,3%,4%下86GeO₂-4Nb₂O₅-10Na₂O(其中数字为摩尔分数)系列玻璃.研究了Nb₂O₅组分对玻璃热稳定性,荧光强度和J-O参数的影响.应用Judd-Ofelt理论,计算了Tm³⁺离子在Nb₂O₅浓度不同时的J-O强度参数(Ω₂,Ω₄,Ω₆)及Tm³⁺离子各激发态能级的自发跃迁概率、荧光分支比以及辐射寿命等光谱参量.根据McCumber理论,计算了Tm³⁺离子能级³F₄→³H₆(1.8 μm)跃迁的吸收截面和受激发射截面.从获得的吸收截面、发射截面与离子掺杂浓度计算了1.8 μm荧光波段的增益截面曲线.在808 nm波长光的激发下,研究了Tm³⁺掺杂玻璃在1.47与1.8 μm附近的荧光特性.发现当Tm₂O₃掺杂浓度为质量百分比3%时,在1.8 μm处的荧光强度达最大,然后随着掺杂浓度的增大,其荧光强度反而降低;当Nb₂O₅摩尔分数含量大约在2%时,Tm³⁺在1.8 μm处的荧光强度最强.并讨论了Nb₂O₅组分变化对玻璃结构与光谱特性的影响情况. 关键词： 3+掺杂锗铌酸盐玻璃')" href="#">Tm³⁺掺杂锗铌酸盐玻璃 红外光谱性质 交叉弛豫 2O₅')" href="#">Nb₂O₅     

Tm3+/Ho3+共掺镓铋酸盐玻璃1.47μm发光特性和能量传递的研究

报道了Tm³⁺/Ho³⁺共掺的镓铋酸盐玻璃14Ga₂O₃-25Bi₂O₃-20GeO₂-31PbO-10PbF₂玻璃1.47μm(S波段)发光和能量传递特征，应用Judd-Ofelt理论计算了玻璃的强度参数Ω_t(t=2，4，6)，自发辐射概率A、荧光分支比β，荧光辐射寿命τ等各项光谱参数以及有效荧光线宽Δλ_eff和峰值发射截面σ^peak_e.通过测量荧光光谱和荧光寿命研究了Ho³⁺离子掺杂浓度对Tm³⁺离子1.47μm波段发光性能的影响，分析了Tm³⁺和Ho³⁺之间的能量传递过程.结果表明一定浓度内Ho³⁺的共掺迅速降低了Tm³⁺：³F₄能级的粒子数，而对³H₄能级粒子数影响不大，从而降低了³F₄和³H₄能级间布居数反转的难度，极大地提高了1.47μm发光效率.研究表明镓铋酸盐玻璃是适用于S波段光纤放大器的一种潜在基质材料，而掺杂一定浓度的Ho³⁺离子有利于提高Tm³⁺离子在1.47μm波段的发光效率. 关键词： 重金属氧化物玻璃 光谱性质 3+/Ho³⁺离子')" href="#">Tm³⁺/Ho³⁺离子 能量传递     

Tm$lt;sup$gt;3+$lt;/sup$gt;掺杂锗碲酸盐玻璃的近2 μm光谱性质

用高温熔融法制备了Tm₂O₃掺杂浓度为0.25, 0.5, 0.75, 1, 1.25, 1.5 mol%的40 GeO₂-35TeO₂-15PbO-5Al₂O₃-2.5CaO-2.5SrO锗碲酸盐玻璃. 热学性质测试表明该玻璃的转变温度为446 ℃, 没有析晶峰. 玻璃的最大声子能量约为750 cm^-1. 利用Judd-Ofelt 理论计算了Tm³⁺ 的Judd-Ofelt 参数Ω_t(t = 2, 4, 6)、不同浓度下Tm³⁺ 离子各激发态能级的自发辐射几率、荧光分支比以及辐射寿命等参数. 采用808 nm 波长抽运源测试了Tm³⁺ 离子的荧光光谱. 发现掺杂浓度为1 mol% 时约1.8 μm 处的荧光强度最强. 根据McCumber 理论计算了³F₄ →³H₆ 的发射截面, 其峰值发射截面为6.5 × 10^-21 cm². 根据速率方程计算了玻璃中OH 引起的Tm³⁺ 的³F₄ 能级的无辐射弛豫速率, 随着Tm³⁺ 浓度增加, OH 对³F₄ 能级的猝灭速率增加. 这种玻璃有望研制成一种新型的约2 μm 的激光玻璃材料. 关键词： 锗碲酸盐玻璃 3+掺杂')" href="#">Tm³⁺掺杂 光谱性质     

Tm3+/Ho3+共掺碲酸盐玻璃的2.0μm发光特性及能量传递

研究了Tm³⁺/Ho³⁺共掺TeO₂-WO₃-ZnO玻璃在808 nm激光二极管抽运下的2.0μm发光特性及Tm³+与Ho³⁺之间的能量传递.应用Judd-Ofelt理论计算了Ho³⁺在碲酸盐玻璃中的谱线强度参量Ω_t (t=2,4,6)、自发辐射概率A_r、辐射寿命τ_r等.计算了Ho³⁺的吸收截面σ_a(λ)和受激发射截面σ_e(λ).结果表明：碲酸盐玻璃中Tm³⁺→Ho³⁺正向能量传递系数大约是Tm³⁺←Ho³⁺反向能量传递系数的18倍.Ho³⁺离子的⁵I₇能级的寿命为3.9ms，2.0μm处的最大发射截面为9.15×10^-21cm².在0.5mol% Tm₂O₃和0.15mol% Ho₂O₃共掺的碲酸盐玻璃中能获得2.0μm的最大增益.通过比较氟化物、碲酸盐和镓铋酸盐重金属氧化物等玻璃中Ho³⁺的量子效率η，σ_e×τ_m值和增益系数G(λ)等，发现Tm³⁺/Ho³⁺共掺碲酸盐玻璃是一种理想的2.0μm激光器用基质玻璃. 关键词： 2.0μm发光 能量传递 增益 碲酸盐玻璃     

Er3+/Yb3+共掺TeO2-WO3-Bi2O3玻璃的光谱性质和上转换发光

本文制备了Er³⁺/Yb³⁺共掺TeO₂-WO₃-Bi₂O₃(TWB)玻璃. 测试和分析了样品的吸收光谱、荧光光谱及上转换发光. 用Judd-Oflet(J-O)理论计算了Er³⁺在玻璃样品中的光谱强度参数,随着Bi₂O₃含量的增加,Ω₂增加,Ω₄ 关键词： 碲酸盐玻璃 光谱性质 上转换     

不同Tm3＋浓度掺杂碲酸盐玻璃光谱性质研究

制备了70TeO₂-20WO₂-10ZnO-xTm₂O₃系统玻璃，根据所测玻璃的吸收光谱，应用Judd-Ofelt(J-O)理论计算出Tm^3＋离子在碲酸盐玻璃的J-O强度参数、Tm^3＋在玻璃中的自发辐射概率A、荧光分支比β及荧光辐射寿命 τ_R 等各项光谱参数.测定了玻璃的荧光光谱，并计算了Tm^3＋在碲酸盐玻璃中的荧光有效线宽、峰值受激发射截 面.比较了Tm^3＋在不同掺杂浓度下的光谱特性，认为当Tm₂O₃掺杂浓度达到 0.8wt％—1wt%时，所获得的荧光强度与荧光线宽达到最佳值，掺Tm^3＋ 碲酸盐玻璃是一种理想的S波段宽带光纤放大器用基质材料. 关键词： 碲酸盐玻璃 宽带光纤放大器 荧光线宽 荧光峰值发射截面     

Ce3+掺杂SiO2-Al2O3-Gd2O3玻璃的闪烁性能

通常, Ce离子掺杂的低密度玻璃有较高的发光效率, 而高密度的Ce离子掺杂玻璃其发光效率很低. 为了解释这一现象, 采用高温熔融法获得了SiO₂-Al₂O₃-Gd₂O₃三元系统的玻璃形成区, 并在还原气氛下制备了Ce³⁺掺杂SiO₂-Al₂O₃-Gd₂O₃以及SiO₂-Al₂O₃-Gd₂O₃-Ln₂O₃ (Ln=Y, La, Lu)闪烁玻璃, 研究了其光谱和闪烁性能. 测试结果显示: 随着Gd₂O₃含量增加, 玻璃紫外截止波长发生红移, 荧光强度降低, 衰减时间缩短; 加入Lu₂O₃, La₂O₃, Y₂O₃后, 紫外截止波长发生红移, 荧光强度降低, 衰减时间变短; 当Gd₂O₃超过10% mol时, X射线荧光积分光产额从相当于锗酸铋 晶体的61%降低到13%. 荧光强度降低、衰减时间缩短的原因是随着玻璃的紫外截止波长红移玻璃的能带宽度变窄, 使得Ce³⁺离子的d电子轨道开始接近玻璃的导带, Ce³⁺离子受辐射后跃迁到d电子轨道的电子会通过导带与玻璃中的空穴复合, 产生电荷迁移猝灭效应.     

Bi离子掺杂GeO2-Al2O3-M(M=Na2O，BaO，Y2O3)玻璃的光学性质

用高温熔融法制备了Bi离子掺杂浓度为1mol%的GeO-B₂O₃-Na₂O (GBNB)，GeO₂-Al₂O₃-Na₂O(GANB)，GeO₂-Al₂O₃-BaO(GABB)和GeO₂-Al₂O₃-Y₂O₃(GAYB)玻璃.测定了样品玻璃的差热曲线、吸收、发射光谱及荧光衰减曲线.实验发现GBNB，GANB，GAYB，GABB的吸收边带逐步发生红移.由于这些吸收边带是由Bi³⁺的6s²电子到Bi⁵⁺ 6s⁰空轨道的跃迁引起.因此推断GBNB，GANB，GAYB，GABB玻璃中Bi⁵⁺离子的含量逐步增加.在GABB，GAYB，GANB三个样品中观察到发光中心约1220nm超宽带荧光发射.荧光强度从GABB，GAYB，GANB逐步减弱，荧光半高宽和荧光寿命逐步变小.这些超宽带的荧光归属为Bi⁵⁺离子的发光所致.从吸收与荧光光谱的变化，推断在GeO₂-Al₂O₃玻璃中引入BaO，Y₂O₃组分有利于Bi⁵⁺离子的形成.讨论了BaO，Y₂O₃化学组分对Bi离子在玻璃中的价态影响的内在机理. 关键词： 5+离子')" href="#">Bi⁵⁺离子 超宽带发光 吸收带 荧光寿命     

GeO2含量对掺铒锗碲酸盐玻璃物性和光谱特性的影响

本文研究了x GeO₂-(70-x)TeO₂-5K₂O-5Na₂O-10Nb₂O₅-10ZnO-0.2Er₂O₃(x=0,10, 25, 50, 70(摩尔百分数))玻璃的物性和光谱特性，讨论GeO₂含量对锗碲酸盐玻璃物性和光谱特性的影响.研究发现：GeO₂的加入提高了碲酸盐玻璃热稳定性， 关键词： 锗碲酸盐玻璃 玻璃热稳定性 荧光     

Er3+及Er3+/Yb3+共掺铋酸盐玻璃光谱性质研究

制备了Er³⁺及Er³⁺/Yb³⁺共掺铋酸盐玻璃，测试了样品的吸收光谱、荧光光谱.应用Judd-Oflet理论计算了Er³⁺在铋酸盐玻璃中的光谱强度参数，分别为Ω₂=(5.47—2.92)×10^-20cm²，Ω₄=(2.16—1.22)×10^-20cm², 关键词： 3+')" href="#">Er³⁺ 铋酸盐玻璃 3+/Yb³⁺共掺')" href="#">Er³⁺/Yb³⁺共掺 光谱性质     

Specific features of photo and thermoluminescence of Tb ions in BaO-M2O3 (M=Ga, Al, In)-P2O5 glasses

BaO-P₂O₅ glasses mixed with the three metal oxides viz., Al₂O₃, Ga₂O₃ and In₂O₃ doped with Tb₂O₃ were prepared. The glasses were characterized by X-ray diffraction and differential thermal analysis. Optical absorption and photoluminescence spectra and thermoluminescence (TL) of these glasses have been studied. From the measured intensities of various absorption bands of these glasses, the Judd-Ofelt parameters Ω₂, Ω₄ and Ω₆ have been evaluated and compared with those of other reported glass systems. The Judd-Ofelt theory could successfully be applied to characterize the absorption and luminescence spectra of these glasses. From this theory various radiative properties like transition probability A, branching ratio β_r, the radiative lifetime τ_r and the emission cross-section σ^E for various emission levels of these glasses have been determined and reported. An attempt has also been made to throw some light on the relationship between the structural modifications and luminescence efficiencies of all the three glasses. The analysis of TL data indicate high non-radiative losses in In₂O₃ mixed glasses.     

Spectroscopic features of Pr, Nd, Sm and Er ions in Li2O-MO (Nb2O5, MoO3 and WO3)-B2O3 glass systems

Li₂O-MO (Nb₂O₅, MoO₃ and WO₃)-B₂O₃ glasses doped with four rare earth ions, viz., Pr³⁺, Nd³⁺, Sm³⁺ and Er³⁺ (of 1.0 mol% each) were prepared. The glasses were characterized by X-ray diffraction, differential scanning calorimetry, ESR, optical absorption and photoluminescence spectra. From the measured intensities of various absorption bands of these glasses, the Judd-Ofelt parameters Ω₂, Ω₄ and Ω₆ have been evaluated. The Judd-Ofelt theory could successfully be applied to characterize the absorption and luminescence spectra of these glasses. From this theory, various radiative properties like transition probability A, branching ratio β_r, the radiative life time τ_r and the emission cross-section σ^E for various emission levels of these glasses have been determined and reported. An attempt has also been made to throw some light on the relationship between the structural modifications and luminescence efficiencies of all the three glasses. The analysis of the data indicated high non-radiative losses in Nb₂O₅ mixed glasses.     

Investigation of spectroscopic properties and thermal stability of Er/Yb-co-doped Bi2O3-B2O3-Ga2O3 glasses

A series of Er³⁺/Yb³⁺-co-doped 60Bi₂O₃-(40−x) B₂O₃ -xGa₂O₃ (BBGA x=0, 4, 8, 12, 16 mol%) glasses have been prepared. The absorption spectra, emission spectra, fluorescence lifetime of Er³⁺:⁴I_13/2 level and thermal stability were measured and investigated. Three Judd-Ofelt intensity parameters Ω_t (t=2,4,6) (Ω₂=(4.67-5.93)×10⁻²⁰ cm², Ω₄=(1.50-1.81)×10⁻²⁰ cm², Ω₆=(0.92-1.17)×10⁻²⁰ cm²) of Er³⁺ ions were calculated by Judd-Ofelt theory. It is found that the Ω₆ first increases with the increase of Ga₂O₃ content from 0 to 8 mol% and then decreases, which is mainly affected by the number of non-bridging oxygen ions of the glass network. The high peak of stimulated emission cross-section () of Er³⁺: ⁴I_13/2→⁴I_15/2 transition were obtained according to McCumber theory and broad full width at half maximum (FWHM=69-76 nm) of the ⁴I_13/2→⁴I_15/2 transition of Er³⁺ ions were measured. The results indicate that these new BBGA glasses can be used as a candidate host material for potential broadband optical amplifiers.     

Er3+/Yb3+共掺碲硼硅酸盐玻璃的光谱性质和热稳定性研究

制备了系列Er³⁺/Yb³⁺共掺碲硼硅酸盐玻璃样品(85-x)TeO₂-15B₂O₃-xSiO₂ (TBS x=0,5,10,15,20 mol%).测试和分析了样品的吸收光谱、荧光光谱、能级寿命、红外透射光谱及差热特性.并通过对Er³⁺离子⁴I_13/2→⁴I_15/2跃迁发射谱线的高斯拟合，设计了一个简单的四能级结构估算了Er³⁺离子⁴I_13/2和⁴I_15/2能级在碲硼硅酸盐中的Stark分裂情况.研究表明SiO₂的引入能有效地改善玻璃的热稳定性和光谱性能，玻璃析晶温度T_x与玻璃转变温度T_g之差(ΔT=T_x-T_g)可达178℃，说明碲硼硅酸盐是一种适合于光纤拉制的玻璃基质材料.比较了不同基质玻璃中Er³⁺离子的荧光半高宽和受激发射截面，结果表明TBS玻璃系统具有较好的带宽性能，是一种优良的宽带光纤放大器候选基质材料. 关键词： 碲硼硅酸盐 热稳定性 高斯拟合 -基')" href="#">OH^-基     

WO3对掺铒碲酸盐玻璃光谱性质的影响

制备了掺铒碲钨酸盐玻璃(80-x)TeO₂-(10+x)WO₃-8BaO-2Na₂O-0.5Er₂O₃(x=0,5,10,15,20)玻璃,研究了WO₃对掺铒碲钨酸盐玻璃的光谱性质. 研究发现：随着WO₃含量的增加,Ω₄,Ω₆先增加后减小,受 关键词： 碲钨酸盐玻璃 3+光谱性质')" href="#">Er³⁺光谱性质 Judd-Offelt理论     

Role of Al2O3 in upconversion and NIR emission in Tm and Er codoped calcium fluoro phosphorous silicate glass system

In this study, the principal role of Al₂O₃ on the features of the photoluminescence spectra of Tm³⁺ ion and upconversion phenomenon in Tm³⁺ and Er³⁺ codoped CaF₂−Al₂O₃−P₂O₅−SiO₂ glass system has been investigated. The concentration of Al₂O₃ is varied from 2 to 10 mol% while that of Er³⁺ and Tm³⁺ is fixed. IR and Raman spectral studies have indicated that there is a gradual increase in the degree of disorder in the glass network with increase in the concentration of Al₂O₃ up to 6.0 mol%. This is attributed to the presence of Al³⁺ ions in octahedral positions in larger proportions. When the glasses are doped with Tm³⁺ ions, the blue and red emissions were observed, whereas in Er³⁺ doped glasses blue, green and red emissions were observed. When the glasses are codoped with Tm³⁺ and Er³⁺ ions and excited at 790 nm, all the three emission lines were observed to be reinforced, especially in the glasses mixed with 6.0 mol% of Al₂O₃. The IR emission band detected at about 1.8 μm due to ³F₄→³H₆ transition of Tm³⁺ ions is also observed to be strengthened due to codoping. The reasons for enhancement in the intensity of various emission bands due to codoping have been identified and discussed with the help of rate equations for various emission transitions.     

用于S波段放大器的掺铥重金属氧化物玻璃发光性质研究

制备了不同Tm³⁺离子浓度的PbO-Bi₂O₃-Ga₂O₃-GeO₂重金属氧化物玻璃，根据吸收光谱计算了JO强度参量以及Tm³⁺离子在玻璃中的自发辐射概率、荧光分支比及荧光辐射寿命等光谱参数.通过测量1470nm波段发射光谱，计算表明该玻璃系统在S波段有较宽的荧光半高宽和较大的峰值受激发射截面，但玻璃中荧光寿命随稀土离子浓度增加呈线性下降，而交叉弛豫速率随浓度的平方迅速增加.研究结果仍可表明掺铥重金属氧化物玻璃是一种理想的S波段宽带光纤放大器用基质材料. 关键词： 重金属氧化物玻璃 3+离子')" href="#">Tm³⁺离子 S波段光纤放大器 光谱性质