四氮杂芳氧基取代酞菁金属配合物的UV-Vis吸收光谱研究

测定了6个系列18种四氮杂芳氧基取代酞菁金属配合物(R4PcM,R=4-吡啶氧基、8-喹啉氧基、2-甲基-8-喹啉氧基;取代位置分别为:a位及β位;M=Ni(Ⅱ),Cu(Ⅱ),Zn(Ⅱ))的UV-Vis吸收光谱.探讨了中心金属、取代基种类及取代位置、溶剂对酞菁金属配合物UV-Vis吸收光谱中Q带最大吸收波长(λmax)的影响,实验结果表明:标题配合物的Q带λmax在680 nm左右;与相同中心金属无取代酞菁金属配合物(669～671 nm)比较,标题配合物的Q带λmax都发生了不同程度的红移;当取代基在α位时其种类对标题配合物Q带λmax 的影响较在β位时显著,且相同取代基及中心金属的α位取代配合物的Q带λmax较β位取代配合物的红移更为明显;中心金属、溶剂对标题配合物的Q带λmax 影响不明显.     

二烷氧基取代酞菁的合成及其吸收光谱的研究

以1,3,3-三氯异二氢氮杂茚和3-(2',2',4'-三甲基-3'-戊氧基)-1,3-二亚胺基异吲哚啉为原料,合成了二烷氧基取代无金属酞菁,产物经IR,UV-Vis,1H NMR及MS表征.在与相应的四烷氧基取代无金属酞菁相比较的基础上,探讨了产物的UV-Vis光谱中的Q带波长及其分裂程度与取代基的数目以及溶剂极性的关系.     

酞菁铜染料的反饱和吸收动力学

本文用速率方程研究了酞菁铜染料氯仿溶液的反饱和吸收的动力学过程,并用YAG倍频调Q脉冲激光入射该样品,验证了理论.通过理论曲线与实验结果的拟合,估算出酞菁铜三重态激发态的吸收截面为2.6×10~(-17)cm~2.     

八丁氧基-2,3-萘酞菁铜(Ⅱ)的合成与UV光谱研究

采用分子碎片法合成了5,9,14,18,23,27,32,36-八丁氧基-2,3-萘酞菁铜,利用元素分析、红外及紫外可见光谱进行了表征。配合物的电子吸收光谱表明:新配制的氯仿溶液中萘酞菁铜的Q带H聚集体和单体的吸收峰在758、854nm处,5h后单体和H聚集体的吸收峰基本消失,出现了798和909nm的错位H/J聚集体以及960nm的J聚集体吸收,12h后主要以795nm的H聚集体形式存在。     

两亲性光敏剂Al(OH)PcSP在醇水和水溶液中的分子光谱和存在状态

研究了具有光动力抗癌活性的两亲性光敏剂磺基邻苯二甲酰亚胺甲基酞菁羟基铝 (Al(OH)PcSP)在醇水和在水中的电子吸收光谱 ,并探讨了其聚集状态。研究表明 ,Al(OH)PcSP在醇水溶液中以单体形式存在 ,醇的碳链和羟基数对Al(OH)PcSP的单体吸收光谱没有显著的影响。但在水中 ,Al(OH)PcSP存在单体 二聚体平衡 ,二聚平衡常数为 5 730 7× 10 4 mol·L-1。Al(OH)PcSP在水中所形成的二聚体的Q带特征吸收峰位于 740 5nm ,相对于其单体特征吸收峰 (6 76 5nm)红移 ,而一般金属酞菁在水中所形成的聚集体Q带特征吸收光谱均相对于单体兰移至位于 6 30nm附近。研究了Al(OH)PcSP的荧光光谱 ,结果说明 ,二聚体的荧光很弱。     

金属酞菁化合物的拉曼光谱研究

本文对沉积在硅基片上的几种金属酞菁化合物薄膜进行了拉曼光谱测量 ,并对其主要振动谱带进行了初步指认 ,同时分析了不同金属原子对于酞菁分子拉曼振动谱的位置和强度所造成的影响     

三-α-(2,4-二甲基-3-戊氧基)溴硼亚酞菁的三阶非线性光学性质研究

应用Z扫描技术，在波长为532nm、脉宽为8ns条件下，对一种新型亚酞菁配合物三-α-(2,4-二甲基-3-戊氧基)溴硼亚酞菁的三阶非线性光学特性进行了研究，结果发现，该新化合物有较强的反饱和吸收(β=3.7×10^-10 m/W)效应和非线性自聚焦折射效应(n₂=7.2×10^-11esu)，其三阶非线性极化率χ⁽³⁾=1.1×10^-11esu.分析了溴硼亚酞菁配合物特殊的锥形分子结构和重原子溴的轴向配位等因素对其三阶非线性光学性质的重要影响. 关键词： 亚酞菁 Z扫描 三阶光学非线性     

酞菁化合物合成及光谱性能研究

为有效对抗高、超光谱成像侦察威胁,实现迷彩绿色涂料与植物的"同谱同色",本文基于酞菁与叶绿素卟啉结构的相似性,开展酞菁化合物合成及植物光谱特征拟合研究。构建吸电子取代基团和二价过渡族中心离子的平面酞菁结构,采用DBU催化法和自制合成装置合成酞菁化合物,探究最佳合成条件和提纯方法,采用分光光度计测试产物的吸收光谱和反射光谱,研究中心离子与聚集方式对酞菁化合物光谱性能的影响。实验结果表明,在催化剂作用下,四硝基金属酞菁在240~250℃时反应时间最短;钴酞菁比铁、锌、铜等作为中心取代离子形成的酞菁产物具有更尖锐的吸收峰,与绿色植物光谱曲线更相似;酞菁化合物的光谱反射曲线随温度、纯度及分散状态对产物聚集状态影响而产生移动。在220~240℃下合成20~30 min的四-硝基钴酞菁吸收光谱符合酞菁化合物Q带吸收特征,且其峰值波长与植物光谱相拟合,为酞菁类颜料在军事、纺织、染料、仿生等领域的应用提供了新方法和新途径。     

α-和β-四烷氧取代酞菁的合成及性能研究

利用 3 烷氧取代邻苯二腈和 4 烷氧取代邻苯二腈与相应的金属盐反应制备了两大系列 (α 和 β )四烷氧取代酞菁 .讨论了温度对中间体烷氧取代邻苯二腈合成的影响 ,探讨了酞菁的两种环合方法 ,并对 β 烷氧酞菁的环合历程进行了初步的考察 .研究了不同取代位置和酞菁的最大吸收波长之间的关系 ,结果表明 ,α 取代烷氧取代酞菁导致λmax红移值较大 ,而相应 β位取代情况下红移值较小 ,说明给电子基团在α位对酞菁骨架的π共轭结构微扰作用比 β位大 .同时研究了溶解度及热失重与酞菁结构的关系     

磺化金属萘酞菁聚集倾向的光谱研究

在磺化金属萘酞菁的荧光光谱和电子吸收光谱的Q谱带上观察到激基缔合物的荧光光谱峰和基态聚集物的吸收光谱峰。荧光光谱和吸收光谱实验说明 ,溶液中聚体分子和单体分子同时存在 ;聚体放出或吸收光子后都解离为单体 ;在荧光光谱中金属萘酞菁的激基缔合物荧光峰相对于单体荧光峰发生红移 ,在吸收光谱中金属萘酞菁基态聚集体的吸收峰相对于单体吸收峰发生蓝移 ,聚集体的荧光光谱和吸收光谱有镜像对称关系。磺化萘酞菁钴浓度较大时 ,其荧光光谱的猝灭较大。     

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.     

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.     

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.     

Speech enhancement by array crosstalk resistant ANC and spectrum subtraction

Microphone array-based speech enhancement has great importance for speech communications and speech recognition. To reduce the aperture of the microphone array and to increase the effect of the speech enhancement will greatly broaden the application areas of the microphone array. An array crosstalk resistant adaptive noise cancellation method is therefore presented. And then an improved spectral subtraction algorithm is further cascaded to obtain better enhancement results. Theoretic analysis and experiments indicate that the proposed scheme needs only a very small microphone array while it simultaneously achieves a higher SNR improvement. Besides, the proposed scheme can be used in many noisy environments and is easy for real-time implementation.     

Multi-pulse operation of a Kerr-lens mode-locked femtosecond laser

Our experimental results show that the presence of a proper amount of negative group velocity dispersion is essential to multi-pulse operation of a Kerr-lens mode-locked femtosecond laser. We demonstrate that the pulse separations and the number of pulses contained within a cavity round trip are strongly dependent on the initial perturbations. The results allow us to get a better understanding on the influences of the convoluted self-phase modulation and intra-cavity dispersions on the stable multi-pulse oscillation in a Kerr-lens mode-locked femtosecond laser.     

Propagation of Helmholtz-Gauss beams in weak turbulent atmosphere

Based on the Rytov approximation of light propagation in weak turbulent atmosphere,the closed-form expressions of field and average irradiance of each one of the four fundamental families of Helmholtz-Gauss (HzG)beams:cosine-Gauss beams,stationary Mathieu-Gauss beams,stationary parabolic-Gauss beams,and Bessel-Gauss beams,which are propagating in weak turbulent atmosphere,are obtained.The results show that the field and average irradiance can be written as the product of four factors:complex amplitude depending on the z-coordinate only,a Ganssian beam.a factor of complex phase perturbation induced by atmospheric turbulence,and a complex scaled version of the transverse shape of the non-diffracting beam.The effect of weak atmospheric turbulence on irradiance distribution of the HzG beam can be ignored.     

An effective method for reducing speckle noise in digital holography

An effective method for reducing the speckle noise in digital holography is proposed in this paper.Different from the methods based on classical filtering technique,it utilizes the multiple holograms which are generated by rotating the illuminating light continuously.The intensity images reconstructed by a series of holograms generated by rotating the illuminating light possess different speckle patterns.Hence by properly averaging the reconstructed intensity fields,the speckle noises can be reduced greatly.Experimental results show that the proposed method is simple and effective to reduce speckle noise in digital holography.     

Influence of purity of HfO2 on reflectance of ultraviolet multilayer

The impurities in two kinds of HfO2 materials and in their corresponding single layer thin films were determined through glow discharge mass spectrum technology and secondary ion mass spectrometry(SIMS) equipment respectively.It was found that ZrO2 was the main impurity in the two kinds of HfO2 either in the original HfO2 materials or in the electron beam deposited films.In addition,the difference of Zr content in the two kinds of HfO2 single laver films was much laxger than that of the other impurities such as Ti and Fe.which showed that it was just ZrO2 that made the difference between the optical performance of the film products including the two kinds of HfO2.With these two kinds of HfO2 and the same kind of SiO2.we deposited HfO2/SiO2 multilayer reflective coatings at the wavelength of 266 nm.Experimental results showed that the reflectances of these two mirrors were about 99.85% and 99.15% respectively,which agreed well with the designed results what were based on the optical constants obtained from the corresponding single layer thin films.