细菌视紫红质（BR）的表面光电压谱研究

采用表面光电压谱系统地研究了细菌视紫红质的光伏特性，结果表明ＢＲ薄膜有着独特的光电性质，并且与ＢＲ薄膜的制备方法和湿度有关，从经过ＨＥＰＥＳ修饰的ＢＲ表面光电压谱，观察到了ＢＲ的中间体Ｍ４１２和Ｏ６４０响应峰。说明ＨＥＰＥＳ对ＢＲ中间体的稳定作用，这些现象可由ＢＲ的光循环和光电压产生机理来解释。     

乙酰丙酮－5，10，15，20－四－对氯苯基卟啉稀土配合物表面光电压谱的研究

采用表面光电压谱法（ＳＰＳ）对乙酰雨酮－５，１０，１５，２０－四－对氯苯基卟啉稀土配合物Ｌｎ（ｐ－Ｃｌ）ＴＰＰａｃａｃ和卟啉配体进行了研究，并对谱带的归属和光电压产生的机制进行了探讨。发现配合物的光伏响应明显小于配体的光伏响应，且随中心离子的不同，其响应也不同。在配合物的ＳＰＳ谱中，除了可看到由配体Ｂ带和Ｑ带吸收所产生的谱带以外，在３００～３５０ｎｍ区出现了一明显的光伏响应带，随稀土中心离子（４ｆ电子数）不同，此光伏响应强度也不同，且随４ｆ电子数而呈规律性的变化。这个谱带可能是由π－π（Ｎ带）跃迁产生的。     

聚乙烯咔唑超分子膜／p－Si体系的表面光电压谱研究

利用ＬＢ技术，以二十碳酸作辅助成膜材料，在疏水处理的Ｐ－Ｓｉ上分别制备了２、４、６、１０和２０层聚乙烯咔唑（ＰＶＫ）超分子膜。对这种体系的表面光电压谱（ＳＰＳ）研究结果表明，表面光电压随ＰＶＫ膜层数的增加而增强，在紫外区增强较为明显。随着膜层数的增加，表面光电压有趋于饱和的趋势。膜对基底的敏化主要是由于ＰＶＫ的光导电性引起的。     

聚乙烯咔唑超分子膜／p—Si体系的表面光电压谱研究

利用ＬＢ技术，以二十碳酸作辅助成膜材料，在疏水处理的ｐ－Ｓｉ上分别制备了２，４，６，１０和２０层聚乙烯咔唑超分子膜。对这种体系的表面光电压谱研究结果表明，表面光电压随ＰＶＫ膜层数的增加而增强，在紫外区增强较为明显。随着膜层数的增加，表面光电压有趋于饱和的趋势。膜对基底的敏化主要是由于ＰＶＫ的光导电性引起的。     

YBa2Cu3O7—δ中Cu—O伸缩振动的红外吸收峰

测量了ｃ轴高度定向的ＹＢａ２Ｃｕ３Ｏ７－δ高Ｔｃ超导薄膜经３００～７５０℃退火后的红外反射光谱和不同掺Ｚｎ量的ＹＢａ２Ｃｕ３－ｘＺｎｘＯ７－δ块状材料的红外吸收光谱。根据这些光谱中Ｃｕ－Ｏ吸收峰的变化，证实了在ＹＢａ２Ｃｕ３Ｏ７－δ体系的红外光谱中，６３０ｃｍ＾－１、５９０ｃｍ＾－１、和５５０ｃｍ＾－１三个吸收峰分别对应的Ｃｕ－Ｏ伸缩振动膜，以及与氧缺位的关系。并讨论了二维电子气屏蔽对吸收峰的影响     

CuPc／InP（O／I）异质结的电学特性及其引起的Raman效应

本文首次报导了ＣｕＰｃ／ＩｎＰ，Ｈ２Ｐｃ／ＩｎＰ（Ｏ／Ｉ）异质结的整流（Ｊ－Ｖ）特性和电容电压（Ｃ－Ｖ）特性，并研究了Ｏ／Ｉ界面态对ＣｕＰｔ ＬＢ膜Ｒａｍａｎ光谱的影响，这种影响导致了ＣｕＰｃ ＬＢ膜分子产生了新的正则振动模。     

Tc=95K的NdBa2Cu3Ox高温超导外延薄膜的研制

本采用倒筒式直流溅射法原位生长和Ｔｃ值为９５Ｋ的ＮｄＢａ２３Ｃｕ３Ｏｘ外延薄膜，样品的ＸＲＤ分析表明，样品为强烈ｃ轴织构，ｃ轴晶胞参数为１．１７４ｎｍ，样品衍射峰的ＦＷＨＭ＝０．２９°，ＲＢＳ分析表明：薄膜的化学计量为Ｎｄ１．０Ｂａ２．０Ｃｕ３．３Ｏｘ。对影响ＮｄＢａ２Ｃｕ３ＯＸ薄膜Ｔｃ值的因素进行了讨论。     

聚丁二炔Langmuir-Blodgett薄膜的光声谱研究(Ⅱ) 光谱综合分析和荧光量子效率

本文用光声谱（ｐｈｏｔｏａｃｏｕｓｔｉｃｓｐｅｃｔｒｏｓｃｏｐｙ,ＰＡＳ）结合光吸收谱、荧光光谱等对在工业上有潜在应用前景的聚丁二炔（ｐｏｌｙｄｉａｃｅｔｙｌｅｎｅ,ＰＤＡ）Ｌａｎｇｍｕｉｒ－Ｂｌｏｄｇｅｔ（ＬＢ）薄膜进行了研究。对经不同气体环境处理的ＰＤＡＬＢ膜的紫外－可见光声谱、光吸收谱和荧光光谱的综合分析表明,ＰＤＡＬＢ膜的激发态弛豫过程中激子和极化子形成的元激发性质。此外,还讨论了ＰＤＡＬＢ膜的荧光量子效率。本文的研究结果表明,用光声谱研究ＬＢ膜,可以获取仅用其他光谱得不到的信息。     

掺Ba的Bi—sr—Cu—O的单晶Raman散射研究

利用Ｒａｍａｎ散射研究了Ｂｉ２Ｓｒ２－ｘＢａｘＣｕＯｙ（ｘ＝０，０．２，０．４）单晶样品的声子振动性质。实验结果表明，在Ｂｉ２Ｓｒ２－ｘＢａｘＣｕＯｙ体的Ｒａｍａｎ谱中主要出现以下几个频率的特征振动模，即１９６，３００，４６０，６２５和６６０ｃｍ＾－１；而频率为１９６，３００，６２５，６６０ｃｍ＾－１的特征峰的强度随着Ｂａ掺杂量的增加而增加。在早期的工作中，我们曾经研究过Ｂａ的掺杂对Ｂｉ２２０１相     

Ba^2＋对卤磷酸盐掺Eu^2＋荧光粉辐照特性的影响

在国家同步辐射实验室的时间分辨光谱站（Ｕ１０Ｂ光束线）研究掺杂Ｅｕ２＋的卤磷酸盐：（Ｃａ，Ｓｒ，Ｂａ）５（ＰＯ４）３ＣｌＥｕ２＋样品和（Ｃａ，Ｓｒ）５（ＰＯ４）３ＣｌＥｕ２＋的真空紫外辐照特性、反射光谱．前者在１８５ｎｍ光的激发下，６０分钟内没有观察到明显的发光强度下降；而后者在１８５ｎｍ光的激发下，１５分钟内就可以观察到其４５０ｎｍ发光的明显变化，从强到弱，直至完全消失．测量了两种样品的反射谱（１００ｎｍ至４００ｎｍ），并根据Ｋ－Ｋ关系计算得出的吸收谱，我们认为：由于Ｂａ２＋的加入，改变了晶格对称性，（Ｏ）－色心的能级发生变化，晶体对１８５ｎｍ附近紫外光的吸收明显降低，从而起到了耐１８５ｎｍ辐照的作用     

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.