GeS2-Ga2S3-CdI2硫卤玻璃的制备及性质

运用传统的熔融淬冷技术制备了GeS2-Ga2S3-CdI2准三元系统玻璃样品,研究了该系统的玻璃形成区,并对其进行了XRD、综合热分析、密度和耐水性分析。结果表明：玻璃转变温度在300～370℃之间;密度在2．900～3．300g／cm^3之间;玻璃易潮解。玻璃的紫外和红外光谱研究表明：CdI2对GeS2-Ga2S3硫系玻璃的红外和紫外截止波长基本不产生影响,玻璃的光透过范围约为0．48～11．5μm。     

CsCl对GeS2-Sb2S3硫系玻璃光学及析晶特性的影响

通过熔融-淬冷法制备了(100-x)(0.9GeS2-0.1Sb2S3.)-xCsCl(x=5,10,15,20,以摩尔计)系列硫卤玻璃.测试了样品的折射率和吸收光谱.根据Tauc方程计算了间接允许光学带隙和直接允许光学带隙.通过差热分析对微晶玻璃析晶动力学进行了研究.利用析晶活化能(E)和频率因子(v),并结合动力学因素和热力学因素分析了玻璃的稳定性.结果表明:随着CsCl含鼍的增加,样品的线性折射率变小,短波截止波长蓝移,光学带隙逐渐增大,玻璃稳定性变差:85(0.9GeS2-0.1Sb2S3)15CsCl玻璃样品较适合制备透明的微晶玻璃,可用于研究硫系基质玻璃与微晶玻璃之间的三阶非线性效应.     

GeS2-Ga2S3-CdS玻璃的折射率与三阶非线性光学性能

采用熔融-急冷法制备了GeS2-Ga2S3-CdS硫系玻璃,用椭圆偏振仪、飞秒光Kerr技术分别测试了在室温玻璃的折射率和三阶非线性光学性能,分析了玻璃的组成、结构对玻璃的折射率与三阶非线性光学性能的影响.结果表明:玻璃的折射率主要决定于Ge的含量;玻璃的三阶非线性极化率χ(3)与玻璃中S-Ge,S--Ga键的数量有关,当玻璃中S-Ge,S-Ga键的数量最多时,离子极化程度最大.电子云的变形程度最大时,具有最大的χ(3).玻璃的超快三阶非线性光学系数与线性折射率n间的关系不遵循Miller规则.     

B2O3–ZnO–SiO2系梯度折射率荧光玻璃的制备及其光学性能

荧光玻璃(PiG)作为荧光转换材料广泛应用于发光二极管(LED)器件封装.然而,使用单一折射率结构的荧光玻璃与封装材料和空气界面间的折射率跨度大,光在界面间传递时会产生很大的损耗.另外,荧光玻璃的烧结温度普遍较高,会降低荧光粉的光转换效率.针对上述问题,制备出梯度折射率结构且能够和黄色荧光粉折射率相匹配的无铅硼锌硅基质...     

溶胶-凝胶法制备梯度折射率玻璃涂层的研究

本文讨论了用溶胶-凝胶法制备Na_2O-B_2O_3-SiO_2系统梯度折射率减反射膜的实验方法。这类玻璃膜具有多孔的微观结构,拥有比基玻璃更小的密度和折射率,膜中微孔结构经过热处理和化学处理后,使薄膜的折射率呈现梯度变化,玻璃涂层在宽的波长范围内起到减反射作用。将它应用于太阳能电池系统中可提高电池效率10%。 文中讨论了膜的厚度影响因素。应用热分折、红外吸收光谱研究了凝胶转化为玻璃的过程,应用开口气孔模型讨论了烧结过程.     

GeS_2–Ga_2S_3–CdS玻璃的折射率与三阶非线性光学性能

采用熔融–急冷法制备了GeS_2–Ga_2S_3–CdS硫系玻璃,用椭圆偏振仪、飞秒光Kerr技术分别测试了在室温玻璃的折射率和三阶非线性光学性能,分析了玻璃的组成、结构对玻璃的折射率与三阶非线性光学性能的影响。结果表明玻璃的折射率主要决定于Ge的含量;玻璃的三阶非线性极化率χ(3)与玻璃中S—Ge,S—Ga键的数量有关,当玻璃中S—Ge,S—Ga键的数量最多时,离子极化程度最大。电子云的变形程度最大时,具有最大的χ(3)。玻璃的超快三阶非线性光学系数与线性折射率n间的关系不遵循Miller规则。     

离子交换法制硫卤玻璃光波导用铯熔盐的研究

研究了自合成的单元 Cs Ac,二元 Cs Ac- Cs NO3 和三元 Cs Ac- Cs NO3 - KAc系统的熔点及凝固点的变化趋势 ,并初步进行了模拟离子交换的实验。实验结果表明 ,二元及三元系统的熔点较单元系统可下降 30℃和 40℃ ,最低可达 1 45℃ ,而凝固点则降至 1 2 6℃ ,满足硫卤玻璃进行离子交换时对熔盐熔点的特殊要求。     

GeS_2-Ga_2S_3-AgCl微晶玻璃的制备及其光学性质

用熔融淬冷法制备了一系列GeS2-Ga2S3-AgCl三元系统硫卤玻璃。研究了样品的密度、热稳定性以及折射率随玻璃组分的变化规律。选取了75GeS2-10Ga2S3-15AgCl玻璃组分进行微晶化处理,并且在350℃下热处理得到了可见至红外透明的微晶玻璃样品。X射线衍射和扫描电子显微镜测试显示,玻璃中析出(Ga4Ge)S4和AgCl微晶相,晶粒尺寸为200～400nm。用Z扫描测量了微晶化前后玻璃样品在800nm波长下的三阶非线性特性,结果表明:在热处理后,玻璃的非线性折射率n2和非线性吸收系数β均明显增加,其中微晶玻璃的最大三阶非线性极化率χ(3)为8.619×10-11esu,是基质玻璃的2.2倍。     

Dy3+掺杂Ge-Ga-Sb-S-CsI硫卤玻璃的热学特性及析晶动力学研究

采用熔融急冷法制备了系列Dy3+掺杂的70GeS2-10Ga2S3-5Sb2S3-10CsI硫卤玻璃样品.测试了样品的可见-近红外和红外透过光谱,分析了Dy3+的光谱吸收及杂质吸收.测试了样品的DTA曲线,分析了样品的热学特性.利用修正Kissinger方程分析了玻璃转变活化能Et、析晶活化能Ec,根据Johnson-Mehl-Avrami方法计算了结晶动力学参数n.研究结果表明:随着Dy3+掺杂浓度的增加,玻璃吸收光谱增强,转变活化能和析晶活化能先增加后减小,x=0.3wt%的玻璃样品最稳定.析晶过程中为两维晶体生长.     

GeS2-Ga2S3-PbCl2硫系玻璃光学及析晶特征的研究

采用熔融-淬冷法制备了GeS2-Ga2S3-PbCl2系列样品玻璃,测试了样品从可见到中远红外的透过光谱和不同升温速率下的DTA曲线,用Kissinger法计算了析晶活化能E和晶体生长指数n.结果表明:该系列玻璃具有较宽光谱,引入PbCl2使玻璃的短波截止波长蓝移,长波截止基本不变.玻璃具有较好的热稳定性,以体积晶化一维生长方式.其中,90 (0.85GeS2-0.15Ga2S3) -10 PbCl2玻璃具有最大的析晶活化能E=134.44 kJ·mol-1,可作为研究硫系玻璃基质与微晶玻璃非线性效应的理想材料.     

Fabrication and Characterization of Gradient Refractive Index Plastic Rods Containing Inorganic Nanoparticles

A novel method was developed for the preparation of GRIN plastic rods containing inorganic nanoparticles. Silver nanoparticles were prepared by using W/O (water in oil) reversed micelle technique in the presence of bis(2-ethylhexyl) sulpho-succinate (AOT) surfactant. The effects of w values (w=[H₂O]/[AOT]), silver nitrate concentration, AOT/isooctane/H₂O ratio, and initiator concentration on the nanoparticle size were investigated. Optical absorption spectra of the micellar samples were recorded on a spectrophotometer at room temperature in the range of 200–900 nm. The nanoparticle size was confirmed by TEM technique. To introduce the nanoparticles into the GRIN plastic rods, methyl methacrylate (MMA) was used instead of isooctane in the organic phase. Nanoparticles were found to increase the refractive index of plastic rods effectively. However, the existence of surfactant may cause the aggregation of nanoparticles leading to the occurrence of light scattering and becoming opaque. We estimated both real image transmission and the three dimensional refractive index distributions of the GRIN plastic rods prepared in this investigation. The results in this investigation suggest that nanoparticles could be used as a dopant to fabricate GRIN plastic rods and increase its refractive index effectively.     

碲铌铅玻璃在400～826nm范围内折射率色散

利用椭圆偏振仪对碲铌铅玻璃的折射率进行了研究.研究结果表明:该系统玻璃有高的折射率和小的阿贝数.利用单振子Drude-Voigt色散方程推导出经验公式n2D＝1.046Nfλ20+1.221.     

BaO-TiO2-SiO2系统高折射率光学玻璃

以BaO-TiO2-SiO2-RmOn系统为研究对象。在SiO2质量百分含量分别为15%、12%、10%时,改变BaO/TiO2的比值,得到一组高折射率光学玻璃。测试玻璃的密度、折射率、阿贝数和紫外到红外波段的透过率等物化性质,研究密度和折射率与组成的关系及影响阿贝数、透过率大小的因素。结果表明,密度随BaO/TiO2比值的增加先增加后减小,折射率随BaO/TiO2比值的增加而减小,折射率和密度变化趋势不一致。TiO2含量是影响阿贝数和透过率大小的主要因素。     

梯度光学功能玻璃研究进展

梯度折射率(GRIN)玻璃是指具有梯度折射率分布的光学功能玻璃,其在光学及光电学领域中具有广阔的应用前景.介绍了GRIN玻璃的形成原理及分类,综述了GRIN玻璃的制备技术及发展现状,讨论了它们各自存在的问题,提出了今后GRIN玻璃的研究方向.     

UV固化低折射率光纤涂料的研制

研制的紫外光固化低折射率光纤类涂料由乙烯基聚硅氧烷、巯基聚硅氧烷、丙烯酸氟硅聚合物、光引发剂及助剂等组成。该涂料折射率小于1.40,固化速率小于0.3 s,吸水率低,拉伸强度为1.58MPa,伸长率为163%,适用温度范围为-60～200℃,可用于双包层石英光纤的外层以及光固化电连接器等方面。     

渐变型聚合物光纤共挤扩散过程工艺参数的正交优化研究

基于相关数学模型，对共挤扩散过程的芯皮层体积流量比、总体积流量、扩散温度等工艺参数进行了正交优化试验，利用计算流体动力学软件FLUENT求解出模拟试验结果。为了合理方便地评价试验结果的优劣，提出了一个评判标准，较好地评价了模拟试验所得光纤折射率分布曲线与抛物线型折射率分布曲线的吻合程度。本研究中，该值约在10^-4～10^-2之间，其值越小说明两者吻合程度越好。正交优化分析表明，芯皮层体积流量比、总体积流量是影响光纤折射率分布的主要工艺参数，当两者分别在1：1、6．9cm^3／min附近时，对应的模拟试验所得光纤折射率分布最接近抛物线型分布。     

Li2B4O7-Bi2O3-WO3玻璃的光学性能研究

采用熔融淬冷方法制备了(100-x)Li2B4O7-x(Bi2O3·WO3)(5≤x≤20)玻璃.采用比重计测定了玻璃密度,分光光度计测量了玻璃的吸收光谱,V棱镜折射仪测量了玻璃折射率.结果表明,随着Bi2 O3·WO3含量的增加,玻璃样品的密度和摩尔体积增大,而氧堆积密度减小;玻璃的吸收光谱中截止波长逐渐向长波方向移动,玻璃的间接跃迁光学带隙、Urbach能和费米能逐渐减小,折射率增大.光学性能的变化和玻璃网络中部分桥氧转变为非桥氧有关.     

光学碱度在玻璃中的应用及其与元素性质的关系

光学碱度是玻璃酸碱性的尺度,是玻璃结构特性的反映,直接影响玻璃的化学和物理性质.本文介绍了玻璃光学碱度的概念、实验测定和理论计算方法,综合评述了玻璃光学碱度与元素电负性、O~(2-)极化率、O1s结合能之间的变化规律,讨论和分析了参数之间变化的定性趋势和定量方程,总结了玻璃光学碱度的本质及其相关性质,对进一步研究光学碱度在不同玻璃系统中的应用及其变化规律的必要性做出了展望.     

Research on Preparation,Structure and Properties of TiO2/Polythiourethane Hybrid Optical Films with High Refractive Index

Hybrid optical films of TiO₂‐triethoxysilane‐capped polythiourethane (TCPTU) with high refractive indices have been prepared via an in situ sol‐gel method. The high refractive index triethoxysilane‐capped polythiourethane (TCPTU) was synthesized by polyaddition of the triethoxysilane‐modified trimercaptothioethylamine (TMTEA) and 2,2′‐dimercaptoethylsulfide (MES) with 2,4‐tolylene diisocyanate (TDI). The titania content in the hybrid films can be adjusted from 0 to 80 wt.‐% by the feed ratio of titania precursor [Ti(OBu)₄] to polymer (TCPTU). Both FTIR and DSC analyses indicate that there is chemical bonding between the titania domain and the polymer chain. TGA results suggest that the titania of high content was successfully incorporated into polymer matrices and this series of hybrid films have good thermal properties. AFM measurements indicate that in the hybrid films the titania domains are of nanosize scale and the domain size averagely decreases from 60–80 nm to 5–20 nm with increasing content of titania, and the variation of surface roughness for the hybrid films has the same trend. These may be relative to the content of TCPTU and the interaction between titania and polymer (TCPTU). The refractive indices of the hybrid films at 632.8 nm increased from 1 632 to 1 879 as the titania content varied from 0 to 80 wt.‐%.

AFM image of the hybrid film.     

Stress Relaxation and Refractive Index Change of As2S3 in Compression Molding

As₂S₃ is one of the chalcogenide glasses that have attracted increasing interests for compression molding applications. This article aimed to evaluate the stress relaxation behavior of As₂S₃ above its glass transition temperature and calculate its refractive index change during cooling. First, creep tests were conducted with cylinder glass specimens at three different temperatures, in order to deduce the shear stress relaxation function by using the relationship with creep compliance function. In addition, the shift factor for thermo-rheological simplicity using Williams–Landel–Ferry equation was obtained. Then, finite element simulation was implemented to verify the calculated shear stress relaxation function. The acquired shear stress relaxation function needs to be modified to compensate the influence of friction on the thickness change in the experiments, so that the simulation results using the modified shear stress relaxation would match the experiments better. Finally, the refractive index changes of As₂S₃ at different cooling rates were modeled by using the Tool–Narayanaswamy–Moynihan (TNM) model for structural relaxation behavior. It is confirmed that the slower the cooling rate is, the less the refractive index drop will be. It was also demonstrated that the refractive index drop is strictly dependent on the cooling rate logarithmically by using TNM model. In summary, the results presented in this article can provide reliable references for viscoelastic characterization of As₂S₃ glass, crucial for compression molding or similar applications.