Er~(3+)掺杂新型GeS_2-In_2S_3-CsI玻璃上转换光谱性质研究

用熔融淬冷法制备了掺Er3+的80GeS2-10In2S3-10CsI(mol%)硫卤玻璃样品,测试了样品的热学稳定性、喇曼光谱、吸收光谱以及上转换光谱,分析了Er3+离子在该玻璃中的上转换发光机理.应用Judd-Ofelt理论计算分析了Er3+离子在该样品中的强度参量Ωt(t=2,4,6)、自发辐射跃迁几率A、荧光分支比β以及辐射寿命τrad等光谱参量.在980nmLD泵浦激发下,首次在该种玻璃中观察到强烈的绿光(526nm、549nm),分别对应于2H11/2→4I15/2和4S3/2→4I15/2的跃迁,其中549nm处绿光较强.549nm处上转换荧光寿命为0.34ms,量子效率为69%.同时研究了绿光(526nm、549nm)上转换发光强度随泵浦激发功率的变化,其发光曲线拟合斜率分别为1.71和2.03,表明绿光是双光子吸收过程.研究结果表明:掺Er3+的80GeS2-10In2S3-10CsI硫卤玻璃是一种上转换绿光激光器的潜在基质材料.     

镨掺杂碲铌铅玻璃的光学性能

研究了掺稀土离子Pr^3 的碲铌铅玻璃的吸收光谱,色度色散和非线性光学性能。结果表明：高浓度的Pr^3 引入到碲铌铅玻璃系统后,仍能够形成均匀透明的玻璃,该玻璃具有高的折射率和非线性折射率。     

Optical and photoelectrical properties of glassy GeS x

Absorption edge, index of refraction, density and spectral dependence of the photoconductivity were measured on amorphous layers of stoichiometric GeS and on glasses GeS _x (1<x<2). An attempt is made to estimate the product of the mobility, lifetime and quantum efficiency for=0·9 m and=1·54 Å.Presented in part at the Int. Conf. on High Resistence Semiconductors, Photoelectrets and Electrophotography, Varna, Bulgaria, November 1973.Authors acknowledge valuable discussions with drs S.Koc and B.Velický, as well as the help of dr. J.Drahokoupil with the X-ray experiments. The glassy samples were kindly prepared by ing. A.Hrubý.     

含银偏振玻璃的制备及光学性能

研究了拉伸还原法制备含银Ｒ２Ｏ－Ｂ２Ｏ３－Ａｌ２Ｏ３－ＳｉＯ２系统偏振玻璃的工艺,得到了工艺波段在６００￣１４００ｎｍ、透光度９０％、消光比１６２：１的玻璃偏振片,着重探讨了拉伸比对偏光性能的影响,并对偏振机理作出了解释。     

Ta2O5对碲铋酸盐玻璃光学性能的影响

通过高温熔融法制备了一系列(90-x)TeO2-10Bi2 O3-xTa2 O5(x=0％,2％,4％,6％,8％)TBT玻璃样品.拉曼光谱和X射线光电子能谱测试结果显示,随着Ta2 O5的加入,玻璃网络中的[TeO3]与[TeO3+1]向[TeO4]转变,玻璃网络结构更加致密.这解释了差示扫描量热法测试中TBT玻璃的...     

Optical,photo-acoustic and electrical switching studies of amorphous GeS2 thin films

This paper reports optical, photo-acoustic and electrical switching investigations of GeS₂ amorphous thin films of different thicknesses, deposited on glass substrates in vacuum. The Tauc parameter (B ^1/2) and Urbach energy (E _U) have been determined from the transmittance spectra, to understand the changes in structural disorder; it is found that B ^1/2 increases whereas E _U decreases as the thickness of the films increases. Based on the results, it is suggested that bond re-arrangement, i.e. transformation from homopolar bonds to heteropolar bonds, takes place with increase in thickness. The thermal diffusivity values of GeS₂ thin films also show the presence of a chemically ordered network in the GeS₂ thin films. Further, it is found that these films exhibit memory-type electrical switching. The observed variation in the switching voltages has been understood on the basis of increase in chemical order.     

BaF2替代BaO 对钡镓锗酸盐玻璃光学性质的影响

在摩尔分数组成x(BaO),r(Ga2O),r(GeO2)为0．20,0．15,0．65的玻璃中,分别以摩尔分数0．05,0．10．0．15和0．20的BaF2替代BaO,研究了氟化物对玻璃折射率和光吸收性质的影响。结果表明,在玻璃中加入氟化物．玻璃折射率和色散降低,玻璃的紫外吸收边向短波侧迁移,而红外吸收边无明显变化。不含氟化物的氧化物玻璃中含有大量的OH基．这些OH基在2．24μm、2．97μm和4．23μm附近引起光吸收．在含氟化物的玻璃中,2．24μm的吸收峰消失,而2．97μm和4．23μm附近的吸收大大减弱。讨论了各OH基吸收峰的起源,利用计算机技术对2．97μm附近的OH基吸收峰进行了高斯峰分离。玻璃在2．24μm的弱吸收可能来自H2O分子的一个伸缩模和两个振动模的结合(p 2ρ)．4．23μm吸收带是由与非桥O形成强氢键的OH基(T-OH…O^--T)伸缩振动引起,而中心位于2．7～3．2μm的OH吸收带为受不同程度氢键影响的OH基伸缩振动吸收．这些吸收带叠加导致OH吸收带出现非对称性加宽,吸收中心随玻璃中OH含量不同发生移动。     

GeS_2-Ga_2S_3-Sb_2S_3-AgCl玻璃的三阶非线性光学特性

采用熔融-急冷法制备了(100-x)Ge20Ga5Sb10S65-xAgCl(x=0,5,10,15,20mol%)系列硫卤玻璃,测试了样品的密度、从可见到中远红外的透过性能以及折射率参量,根据Z-扫描测试原理用钛宝石飞秒激光器测试了样品的三阶非线性特性随波长变化的特性.结果表明:非线性折射率n2和非线性吸收系数β随着波长的增加而增加,AgCl含量为20mol%的样品在800nm处的非线性折射率n2=1.581×10-10esu,非线性吸收系数β=4.707cm/GW.与传统硫系玻璃相比,三阶非线性性能明显提高.     

Ti4+掺杂硼硅酸盐微晶玻璃的光谱特性

制备了Ti4+掺杂硼硅酸盐玻璃,根据玻璃样品的差热分析(DTA)进行微晶化处理,测试了Ti4+掺杂硼硅酸盐微晶玻璃的X射线衍射(XRD)谱、透射电镜(TEM)图像、吸收光谱和发射光谱.根据Scherrer公式计算了BaYF5微晶的平均晶粒尺寸并与TEM图像进行比对.在紫外光激发下,观察到Ti4+掺杂BaYF5硼硅酸盐微...     

Optical Properties of Rare Earth Doped Transparent Oxyfluoride Glass Ceramics

Optical properties of Eu^3? ions in oxyfluoride glasses and glass ceramics doped with low concentration (0.1 mol%) have been analysed and compared with previous results for high concentrated samples (2.5 mol%). The Eu^3? ions in the low dopant concentration glass ceramics are diluted into like crystalline environments with higher symmetry and lower coupled phonons energy than in the precursor glasses. Fluorescence line narrowing measurements indicate the presence of two main fluoride site distributions for the Eu^3? ions in these low concentrated glass ceramics.     

Optical Properties of Yb3+ Doped Bi2O3-3B2O3 Glass

The transmission and fluorescence spectra of Yb3+ doped Bi2O3-3B2O3 glass were measured. The emission cross section have been evaluated using the measured absorption apectra and principle of reciprocity. The measured long lifetime τm(1.0 ms) and large emission cross section σem(1.423 pm2) indicate that Yb3+ doped Bi2O3-3B2O3 glass is a promisiong laser material.     

取代基对卟啉三阶光学非线性及弛豫过程的影响

研究了取代基对卟啉三阶光学非线性和激发态弛豫过程的影响，发现在同一取代位置，推电子基团取代使得卟啉三阶光学非线性极化纱数Ｘ值相对影响，而吸电子基团取代使得卟啉Ｘ值相对减少，对同一取代基在不同取代装置，发现推电子基团在邻位取代的Ｘ值大于其在对位取代卟啉的Ｘ值，而吸电子基团在邻位取代的Ｘ值小于其在对位取代卟啉的Ｘ值，另外，还发现推电子基团取代的卟啉弛豫过程比吸电子基团取代的卟啉弛豫过程快７倍。     

The Optical Properties of Polydisperse Glass Microsphere Ensembles in the Infrared Spectral Region

Semitransparent composites with glass microspheres are promising modern materials. In particular, they contribute to the increase of the efficiency of heat-insulating coatings. An experimental study of the transmission and scattering of infrared radiation (at wavelengths from 2 to 25 μm) by a sodium borosilicate glass microsphere powder is presented. The spectra, angular-scattering patterns, and the degree of polarization of scattered radiation were studied.     

Optical Properties of Yb~(3 ) Doped Bi_2O_3-3B_2O_3 Glass

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｔｈｅｏｐｔｉｃａｌｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｇｌａｓｓｅｓ,ｓｕｃｈａｓｇｌａｓｓｔｒａｎｓｐａｒｅｎｃｙａｎｄｔｈｅｉｒｃａｐａｂｉｌｉｔｙｔｏａｃｃｅｐｔｒａｒｅｅａｒｔｈｉｏｎｓａｓｔｈｅｌｕｍｉｎｅｓｃｅｎｔｃｅｎｔｅｒｓ ,ａｒｅｅｓｓｅｎｔｉａｌｆｏｒｔｈｅｉｒｕｓｅｉｎｇｌａｓｓｌａｓｅｒｔｅｃｈｎｏｌｏｇｙ .Ｄｕｒｉｎｇｔｈｅｌａｓｔｆｅｗｙｅａｒｓ,ａｌａｒｇｅｖａｒｉｅｔｙｏｆｉｎｏｒｇａｎｉｃ ｇｌａｓｓｅｓｈａｖｅｂｅｅｎｄｅｖｅｌｏｐ…     

Fluorescence and Nonlinear Optical Properties of Organic Dye in Inorganic Glass and Xerogel Matrices

ＦｌｕｏｒｅｓｃｅｎｃｅａｎｄＮｏｎｌｉｎｅａｒＯｐｔｉｃａｌＰｒｏｐｅｒｔｉｅｓｏｆＯｒｇａｎｉｃＤｙｅｉｎＩｎｏｒｇａｎｉｃＧｌａｓａｎｄＸｅｒｏｇｅｌＭａｔｒｉｃｅｓＺＨＡＮＧＱｉｎｙｕａｎＪＩＡＮＧＺｈｏｎｇｈｏｎｇ（ＳｈａｎｇｈａｉＩｎｓｔ...     

Optical Properties of YFe2 and TbFe2 Compounds

Physics of the Solid State - The ellipsometric studies of the optical properties of intermetallic YFe2 and TbFe2 compounds have been performed in the wavelength range 0.22–15 μm, and a...     

Effect of Laser Irradiation on Optical Properties and Damage Threshold of Nd:Glass

Journal of Russian Laser Research - We investigate the effects of 10.6 μm CO2 laser irradiation and 572 nm dye laser irradiation on optical properties and laser damage threshold of Nd:glass....     

Optical Properties of Nanocomposites Based on Zinc and Tin Sulfides in Nanoporous Silicate Glass

Optics and Spectroscopy - The spectra of optical density, luminescence, and Raman scattering of crystalline micro- and nanodendrites of zinc and tin sulfides in silicate nanoporous glass (NPG) with...     

Specific Features of Photoluminescence and Nanosecond Relaxation of Photocurrent in CuIn5S8 Crystals upon Strong Optical Excitation

Optics and Spectroscopy - Intense luminescence and nanosecond relaxation of photocurrent upon strong optical excitation have been observed in CuIn5S8 crystals grown by slow melt cooling at a...