掺稀土离子的CaS：Bi荧光粉的发光性质

采用固相反应法合成了单掺和双掺稀土离子Ｔｍ３＋、Ｅｒ３＋的ＣａＳ：Ｂｉ荧光粉，测定了试样的荧光光谱和有效余辉。与ＣａＳ：Ｂｉ相比，掺入Ｔｍ３＋、Ｅｒ３＋的荧光粉，Ｂｉ３＋特征发射峰４４７ｎｍ增强，有效余辉延长。表明Ｔｍ３＋、Ｅｒ３＋对Ｂｉ３＋在ＣａＳ中的发光产生了敏化作用，Ｔｍ３＋、Ｅｒ３＋在基质晶格中造成了缺隙深能级，讨论了Ｔｍ３＋、Ｅｒ３＋对ＣａＳ：Ｂｉ发光敏化作用的大小和在基质中造成缺隙能级。的深浅。     

全色等离子体平板显示器用发光材料

本文介绍全色等离子体平板显示器目前水平，对真空紫外辐射激发荧光粉的要求，迄今使用的两种红色荧光粉ＢＯ：Ｅｕ和Ｙ２Ｏ３：Ｅｕ，两种绿色荧光粉Ｚｎ２ＳｉＯ４：Ｍｎ和ＢａＡｌ１２Ｏ１９：Ｍｎ，及蓝色荧光粉ＢａＭｇＡｌ１４Ｏ２３：Ｅｕ＾２－的晶体结构和发光特性。     

CaS:Cu~+,Eu~(2+)的光致发光及其在农业生产中的应用

研究了Ｃｕ＋，Ｅｕ２＋共激活的ＣａＳ的发光性质及激活剂浓度与荧光性质的关系．Ｃｕ＋和Ｅｕ２＋的发射光谱分别在４３０ｎｍ附近及６３０ｎｍ附近，它们是由Ｃｕ，Ｃａ－Ｖｓ２＋中心的离子发射和Ｅｕ２＋的５ｄ－４ｆ跃迁发射产生的．实验结果表明，Ｃｕ＋对Ｅｕ２＋荧光发射有较强的敏化作用，Ｅｕ２＋对Ｃｕ＋发射峰值波长和强度也有显著影响；单掺Ｅｕ２＋或Ｃｕ＋的荧光粉是良好的农用薄膜红，蓝光转换剂，共掺Ｅｕ２＋和Ｃｕ＋的ＣａＳ荧光粉作光转换农膜添加剂可望人工模拟叶绿素的吸收光谱，使作物在植物最佳生长作用光谱环境中生长，促使作物早熟或提高作物产量     

NH4Cl作助熔剂合成CaS：Ce的光谱特性及其浓度效应

以ＮＨ４Ｃｌ作助溶剂，碳还原硫酸钙的方法合成了ＣａＳ：Ｃｅ。在紫外光激发下，ＣａＳ：Ｃｅ中存在着Ｃｅ＾３＋的＾２Ｄ－＾２Ｆ５／２（５００ｎｍ）和＾２Ｄ－＾２Ｆ７／２（５５０ｎｍ）跃迁发射，但在蓝色光激发下，只有波峰为５３２ｎｍ半宽度为９２ｎｍ的宽带发射。当Ｃｅ＾３＋的浓度为０．０７５ｍｏｌ％时，＾２Ｄ－＾２Ｆ５／２跃迁发射强度与＾２Ｄ－＾２Ｆ７／２跃迁发射强度相等，而５３２ｎｍ发射猝灭。     

CaS：Bi粉末发光材料

制备了ＣａＳ：Ｂｉ粉末发光材料，用Ｘ射线衍射分析了材料的晶体结构，测量了其激发光谱，发射光谱和直流电致发光光谱，蓝色发光峰位于４５０ｎｍ。     

高T_c氧化物体系的相关系和晶体结构

本文综述了Ｒ－Ｂａ－Ｃｕ－Ｏ体系，Ｂｉ－Ｓｒ－Ｃａ－Ｃｕ－Ｏ体系，Ｔ１－Ｂａ－Ｃａ－Ｃｕ－Ｏ ＃系，Ｔ１－Ｓｒ－Ｃａ－Ｒ－Ｃｕ－Ｏ体系以及Ｐｂ－Ｓｒ－Ｒ（Ｃａ）Ｃｕ－Ｏ体系超导相的相关系和晶体结构，并讨论了超导相的结构特点和它们之间的相互关系．     

CaxSr1—xS：Bi,Tm,Cu和CaS：Eu荧光材料的研究

所作的一部分工作是对长余辉的荧光材料ＣａｘＳｒ１－ｘＳＢｉ，Ｔｍ，Ｃｕ（ｘ＝０，０．７５，１）进行了研究．ＣａＳ和ＳｒＳ两种基质材料高温互溶后，因为基质的晶体微结构上的变化引起Ｂｉ３＋离子荧光效应的变化，即发光的发射波数发生改变．另一部分工作是对ＣａＳＥｕ加入陷阱机制后发光效应的研究．新的陷阱机制的引进，使得其余辉效应有较大的延长．     

Ba,Sr,Ca在Co／γ—Al2O3催化剂上CO氧化的作用机制（II）

用硝酸盐水溶液等量共浸法制备了分别在７５０℃和９００℃焙烧的系列催化剂Ｃｏ－Ｍ／γ－Ａｌ２Ｏ３（Ｍ＝Ｃａ，Ｓｒ，Ｂａ，Ｃｏ３Ｏ４／Ａｌ２Ｏ３＝８ｗｔ％，Ｍ／Ｃｏ＝１５ｍｏｌ％）测定了ＣＯ氧化转化率，用ＢＥＴ表面，ＸＲＤ，ＸＰＳ，ＤＴＡ和ＴＰＲ等手段研究了助剂Ｂａ，Ｓｒ，Ｃａ的作用，结果表明，加入助剂后，ＣＯ完全转化温度下降了２０～６０℃左右，助剂的作用顺序为Ｃａ＞Ｓｒ＞Ｂａ，实验表明，７５０℃和９     

不同气氛退火对Tl2Ba2CaCu2Ox超导电性的影响

本研究了Ａｒ气和Ｈ２／Ａｒ混合气体退火对Ｔｌ２Ｂａ２ＣａＣｕ２Ｏｘ（２２１２）超导体超导电性的影响。实验表明，在Ａｒ气中４００℃退火１至１２小时后Ｔｌ２Ｂａ２ＣａＣｕ２Ｏｘ的Ｔｃ（Ｒ＝０）随退火时间的增长明显降低。Ｘ－光衍射分析证实，在Ａｒ气或Ｈ２／Ａｒ混合气体中退火前后，Ｔｌ２Ｂａ２ＣａＣｕ２Ｏｘ超导体的结构没有发生变化。     

Ca0.9Sr0.1S:Bi3+,Tm3+荧光材料的光学性质

Ｃａ０．９Ｓｒ０．１Ｓ：Ｂｉ＾３＋,Ｔｍ＾３＋是一种复合掺杂复合基质荧光材料。在此给出了４４０ｎｍ和５２０ｎｍ发射的激发谱,２５０ｎｍ到３５０ｎｍ的激发的发射谱,以及４００ｎｍ到５２０ｎｍ的荧光衰减谱。紫外光区域的激发谱表明,Ｃａ０．９Ｓｒ０．１Ｓ：Ｂｉ＾３＋,Ｔｍ＾３＋有两个主要的能量传递体系,３２５ｎｍ的复合掺杂中心Ｔｍ＾３＋的ＣＴ跃迁激发体系,和Ｂｉ＾３＋的自身激发体系。紫外激发的荧光发射谱     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission

We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed.     

Resonance scattering of canonical elastic shells in absorbing fluid medium

Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell.     

Single-beam self-referenced phase-sensitive surface plasmon resonance sensor with high detection resolution

A versatile and low-cost single-beam self-referenced phase-sensitive surface plasmon resonance(SPR)sensing system with ultra-high resolution performance is presented.The system exhibits a root-mean-square phase fluctuation of ±0.0028.over a period of 45 min.i.e.a resolution of±5.2×10-9 refractive index units.The enhanced performance has been achieved through the incorporation of three design elements:a true single-beam configuration enabling complete self-referencing so that only the phase change associated with SPR gets detected,a differential measurement scheme to eliminate spurious signals not related to the sensor response,and the elimination of retardation drifts by incorporating temperature stabilization in the liquid crystal phase modulato .Our design should bring the detection sensitivity of non-labeling SPR biosensing closer to that achievable by conventional fluorescence-based techniques.     

Influences of SiO2 protective layers and annealing on the laser-induced damage threshold of Ta2O5 films

Ta2O5 films are prepared on BK7 substrates with conventional electron beam evaporation deposition.The effects of SiO2 protective layers and annealing on the laser-induced damage threshold (LIDT) of the films are investigated.The results show that SiO2 protective layers exert little influence on the electric field intensity(EFI)distribution,microstructure and microdefect density but increase the absorption slightly.Annealing iS effective on decreasing the microdefect density and the absorption of the films.Both SiO2 protective layers and annealing are beneficial to the damage resistance of the films and the latter is more effective to improve the LIDT.Moreover,the maximal LIDT of Ta2O5 films is achieved by the combination of SiO2 protective layers and annealing.