氟化铟基玻璃中Er^3＋离子光谱性质的研究

测定了掺Ｅｒ＾３＋氟化铟基玻璃的吸收光谱，激发光谱和荧光光谱，计算了该玻璃的强度参数Ω（ｔ＝２，４，６），给出了Ｅｒ＾３＋离子的发光特性的计算结果，并与掺Ｅｒ＾３＋的氟锆酸盐玻璃做比较，解释了基质玻璃对Ｅｒ＾３＋离子发光特性的影响。     

Yb3+离子在氟化物玻璃中的红外光谱性质

根据测得的Ｙｂ＾３＋离子在氟锆酸盐玻璃（ＺＢＬＡＮ）中的吸收光谱和荧光光谱,分析了Ｙｂ＾３＋离子在氟锆酸盐玻璃中的吸收特性和发光特性;计算了Ｙｂ＾３＋离子的发射截面σｅ,讨论了Ｙｂ＾３＋离子的再吸收效应;增加Ｙｂ＾３＋离子掺杂浓度不会发生浓度淬灭效应。     

Bi系银衬底厚膜的制备及其传输电流性质

采用物理沉积法制了名义组分为Ｂｉ１．８Ｐｂ０．４Ｓｒ２Ｃａ２Ｃｕ３Ｏｙ的银夹板厚膜成相的影响表现为热处理过程中银夹板阻止了厚膜中的物质尤其是Ｐｂ的挥发，使厚膜处于低氧压状态，加速了８０Ｋ相向１１０Ｋ相的转化，测量了银衬底厚膜在外加磁场平行和垂直于厚膜表面的传输临界电流密度Ｊｃ与磁场Ｈ的关系。典型数据为Ｊｃ＝２．３１×１０＾４Ａ／ｃｍ＾２（７７Ｋ，０Ｔ），３．６×１０＾２Ａ／ｃｍ＾２（７７Ｋ，１Ｔ）     

新间接紫外光度法测定微量SO3^2—

在ｐＨ７．０混合磷酸盐介质中,ＳＯ３＾２－使Ｉ３＾－与ＣＴＭＡＢ生成离子缔合物ＣＴＭＡ＾＋,Ｉ３＾－而褪色,从而建立了测定ＳＯ３＾２－的新间接紫外光度法,测定波长为３６５ｎｍ,ＳＯ３＾２－浓度在０－２５μｇ／２５ｍＬ内服从比耳定律,表观摩耳吸光系数为ε＝６．０４×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,可用于食品中微量ＳＯ３＾２－的测定,其结果满意。     

锆(Ⅳ)-桑色素-曲拉通显色反应的研究与应用

本文提出在曲拉通Ｘ－１００存在下,以桑色素为显色剂吸光光度法测定痕量锆的新方法。在「Ｈ＾＋」＝０．５－２．０ｍｏＬ的ＨＣｌ介质中形成三元配合物,其最大吸收波长为λｍａｘ＝４３０ｎｍ,摩尔吸光系数ε４３０＝９．８×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,锆量在０－１５μｇ／２５ｍＬ范围内遵守比耳定律,该方法简捷、准确,应用于铝合金中痕量锆的测定,共存离子不干扰,测定令人满意。     

新试剂2—（4—安替比林偶氮）—5—二乙氨基本胺与钯显色反应的研究及应用

在ｐＨ＝５．０ＨＡｃ－ＮａＡｃ缓冲介质中,吐温－８０存在下,２－（４－安替比林偶氮）－５－二乙氨基苯胺（ＡＤＥＡ）与钯生成２：１红色络合物,λｍａｘ＝５３０ｎｍ,δ－６．１５×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,钯的含量在０－２０μｇ／２５ｍＬ内符合比耳定律,本方法用于钯催化剂中痕量钯的测定,结果令人满意。     

高TcBOLOMETER

章给出了高Ｔｃ超导红外探测器的理论分析；器件设计。并报道了用ＧｄＢａ２Ｃｕ３Ｏ７－ｘ薄膜制备的红外探测器的实验结果。得到的最好结果是噪声等效功率ＮＥＰ（５００，１０，１）＝１．４×１０＾－１１ＷＨｚ＾－１／２；探测率Ｄ＾＊（５００，１０，１）４．２×１０＾９ｃｍＨｚ＾１／２Ｗ＾－１；响应度Ｒｖ＝１０６５Ｖ／Ｗ。     

970nmLD激发Tm^3＋,Yb^3＋掺杂的MFT玻璃材料上转换发光的研究

设计并制备了一种Ｔｍ＾３＋、Ｙｂ＾３＋共掺杂的多氟化物调整碲酸盐（ＭＦＴ）玻璃材料,其组份为５０ＴｅＯ２－１４．ＰｂＦ２－１０ＡｌＦ３－１０ＢａＦ２－１０ＮａＦ－０．１Ｔｍ２Ｏ３－５Ｙｂ２Ｏ３。测量了该玻璃系统的Ｒａｍａｎ散射光谱,在９７０ｎｍＬＤ激发下裸眼可以观察到很强的蓝色我,光谱测量证实这个蓝色发射（４７６ｎｍ）来源于＾１Ｇ４→＾３Ｈ６的跃迁,同时,还有两个较弱的红色发射源于＾１Ｇ４→＾３Ｈ     

Tl—1223超导体及其复Ag带的制备

研究了用产中分熔化法制备Ｔｌ－１２２３超导体的工艺。样品的名义组成为（Ｔｌ０．５Ｐｂ０．５）（Ｓｒ０．８Ｂａ０．２）Ｃａ２Ｃｕ３Ｏｙ。经熔化退火的样品，其磁化电流的７７Ｋ和１Ｔ下大于２×１０＾４／ｃｍ＾２。用熔化－退火的超导粉作原料制得的复Ａｇ带短样，Ｊｃ达１．６－１．７×１０＾４Ａ／ｃｍ＾２（７７ｋ，０Ｔ）。采用烧结后的超导粉作原料，在制备复Ａｇ带的工艺中，如用熔化－退火的热处理制度，可以免除…     

氟锆酸盐玻璃中Tm^3＋和（Tm^3＋＋Ho^3＋）离子的光谱研究

给出氟锆酸（ＺＢＬＡＮ）玻璃中＾Ｔｍ＾３＋和Ｈｏ＾３＋离子的Ｑｔ参量，并与氧化物玻璃中Ｔｍ＾３＋和Ｈｏ＾３＋的Ｑｔ参量进行了比较，用３７５ｎｍ和４６８ｎｍ波长激发单掺ＺＢＬＡＮ中Ｔｍ＾３＋离子，获得来自Ｄ，２，＾３Ｈ４，Ｇ４能级不同发射波长的发光强度随掺杂浓度的变化，而用小于１μｍ的激发波长激发发单掺Ｔｍ＾３＋或Ｈｏ＾３＋样品，获得近红外区发射光谱。文中给出掺杂浓度对于Ｔｍ＾３＋和Ｈｏ＾＋近红外区     

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.     

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.     

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.     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

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.     

Improvement of four-wave mixing-based wavelength conversion efficiency in dispersion shifted fiber by 40-GHz clock pumping

40-GHz clock modulated signal as a pump to improve the efficiency of four-wave mixing (FWM)-based wavelength conversion in a 26.5-km dispersion shifted fiber (DSF) is investigated. The experimental results demonstrate that the conjugated FWM component has higher intensity with the clock pumping than that with the continuous-wave (CW) light pumping. The improvement of FWM-based wavelength conversion efficiency is negligible when the pump power is less than Brillouin threshold. But when the pump power is greater than Brillouin threshold, the improvement becomes significant and increases with the increment of pump power. The improvement can increase up to 9 dB if pump power reaches 17 dBm.     

Characterization of PolyA and PolyC mismatches by Raman spectroscopy

A.C mismatches are studied by Raman spectral characterization of PolyA, PolyC, and their equimolar complex in solution of 0.14 mol/L Na ,pH7.0.Experimental results show that A·C mismatches occur to be A/B (mainly A) conformers, and unlike Watson-Crick base pairing, this kind of mismatches is stabilized by only one hydrogen bond involving cytosine N4H2 and adenine N7.The formation of A·C complex makes the base stacking interactions much stronger, and conformation of the backbone more ordered, which leads to obvious Raman hypochromic effect with some shifts in corresponding bands.