共轭聚合物聚苯胺三阶非线性的研究进展

有机非线性光学材料因其优良的性能而引起广泛关注,共轭聚合物聚苯胺(PANI)的研究引起了人们的极大兴趣,文章综述了近年来聚苯胺及其衍生物三阶光学非线性的研究进展。     

共轭有机高聚物PPQ薄膜非线性吸收的Z-扫描测量

用 Z-扫描方法在 532 nm波长测量了共轭高聚物 PPQ( polyphenylquinoxalines)薄膜的三阶光学非线性参数 ,发现其较强的非线性 (双光子 )吸收系数β≈ 0 .59cm/ MW。同时得到 Kerr系数n2 ≈ 9.5× 10 -10 esu,与用其他方法的测量结果较好地吻合。     

双包层非线性单轴光纤传播常数的计算

基于严格的矢量波理论,用摄动法导出了计算双包层非线性单轴光纤导模或泄漏模传播常数的公式。     

Response of the Internal Electric Field in CdZnTe to Illumination at Multiple Optical Powers

Manipulation of CdZnTe (CZT) crystals using illumination is a useful tool for altering the internal electric field present under normal bias conditions. The interactions with carriers that are trapped at either terminal are visualized by the electric field distribution through polarization. In this report, we demonstrate an ability to selectively manipulate the internal electric field of CZT using multiple-wavelength light illumination at various optical powers. The internal electric field polarization can be controlled using changes in optical power. We also investigate the electric field distributions using multiple optical powers to examine the light response as a function of light penetration depth.     

光场与掺杂向列相液晶薄膜相互作用的若干问题

从激光与掺杂液晶薄膜相互作用的角度，介绍了掺杂液晶非线性光学的多个不同侧面，阐述了光场诱导液晶分子指向矢的重新取向问题、偶氮物掺杂液晶超大光学非线性问题、以及掺杂液晶光限幅的研究现状和进展。     

群速度色散对非线性光纤环镜型OTDM解复用器影响的理论与数值分析

本文就群速度色散对非线性光纤环镜型ＯＴＤＭ解复用器的影响进行了理论与数值分析．首先给出了描述群速度色散与非线性效应之间相互作用的耦合非线性薛定谔方程组,然后用分步傅立叶方法对该方程组进行了数值求解．经分析指出,要达到一定的开关性能,孤子阶数、色散的正负、脉冲宽度及控制和信号脉冲之间的走离时间应满足一定的条件．     

Thermal and Transmission Properties of UV Nonlinear Optical Material—ZnCd（SCN）4 Crystal

Zinc cadmium thiocyanate(ZCTC),ZnCd(SCN)4, has been discovered as a UV second-order nonlinear optical coorination crystal.Its thermal and transmission properties are reported.The thermal decomposition is characterized by using the X-ray powder diffraction (XRPD) and infared (IR) spectroscopy at roon temperature.The absorptions of intrinsic ions and ZCTC in a solution state are discussed as well as transmission properties of the ZCTC crystal.An effective method of reducing the surface reflection loss of ZCTC crystal is introduced.     

π共轭聚吡咯衍生物非线性响应时间的测量

合成一种新型π共轭聚吡咯衍生物———聚吡咯 { 2 ,5 二 [(对硝基 )苯甲烯 ]} (PPNB) ,制备了该高分子的N 甲基 2 吡咯烷酮 (NMP)溶液和聚乙烯醇 (PVA)复合薄膜。用 5 32nm ,8ns脉冲激光作抽运光源 ,氦氖激光 (6 32 8nm ,CW)为探测光源 ,测量了该高分子的非线性光学响应过程 ,测得PPNB/NMP溶液和PPNB/PVA薄膜的激光诱导折射率的建立时间分别为 4μs和 5 μs,恢复时间分别为 30ms和 5ms。引起这种非线性效应的机制可能主要是热光非线性效应。     

光纤通信非线性补偿中的非线性光环路镜

介绍了用于光纤通信非线性补偿中的几种非线性光环路镜(NOLM,包括ANOLM、DALM、NALM、DILM、RA-NOLM、NBLM及DANLM)的构成和功能,给出了部分传输补偿实例,指出NOLM的发展趋势是小型化和集成化。     

新型两路空间光通信系统研究

本文提出以量子器件为核心的两路空间光通信方案，在强太阳光背景下传输声音、图象，其信噪比高于传统滤光片接收机２～３个量级。     

Nonlinear Liquid Crystal Polymer and Its Applications

The transparent solid medium of a thermotropic liquid crystal polymer have a cobm structure of mesogenic side chanis which exhibit a nonlinear optical re-spense of electronic origin.The main chain of the liquid crystal polymers can be selscted from a number of suitable polymerized monomeris and comonomeric structures such as polyvinyl,polysiloxane,polyoxyalkylene,polyester etc.The electropitc light modulator is provided,which have potential to using in the systems of laser modulation and deflec-tion,and information control in optical circuitry etc.     

聚合物光纤在中国的应用发展

聚合物光纤在中国的应用是从20世纪80年代中后期首先在丁艺品的应用开始的，目前已成为聚合物光纤在中国最大的应用领域，随后向广告、显示和装饰装潢应用领域扩展，至20世纪90年代末期，聚合物光纤向照明、传像、传感和短距离数据传输应用发展，现已取得很大的进步。     

电晕极化聚合物膜非线性光学特性

报道了一组新设计的染料分子以掺杂和共聚两种形式加入基质ＰＭＭＡ聚合物．并制成固体薄膜。采用电晕极化（Ｃｏｒｏｎａ－Ｐｏｌｉｎｇ）．获得较大二阶非线性系数（ｄ３３＝１．２６×１０－７ｅｓｕ）．具有较好稳定性。详细研究了极化条件、分子结构、加入基质方式对非线性光学强度和稳定性的影响。     

交联型极化聚合物二阶非线性光学特性研究

本文研究了偶氮类交联型极化聚合物薄膜的二次谐波产生及其线性电光效应。测量结果为ｄ３３＝２．３×１０－８ｅｓｕ；ｒ３３＝５．８×１０－８ｅｓｕ。在误差范围内与理论计算值符合。     

Effect of Electron–Electron Interaction on Nonlinear Near-Resonance Electromagnetic Response of Quantum Dot Systems

We theoretically investigated the nonlinear near-resonance electromagnetic response of quantum dot systems caused by interlevel electron transitions. The effect of electron-electron (e–e) interaction in the systems on the response was taken into account by the use of a self-consistent field approach in the quasi-static limit within the density matrix formalism under stationary conditions. Analysis and numerical simulations showed the possibility of realizing the intrinsic optical bistability in quantum dot systems due to the e–e interaction. The results obtained could find application in design, fabrication, and exploitation of all-optical quantum dot-based switches.     

适用于光通信工程的智能光功率计

本文介绍一种适合于光通信工程的光功率计(QGG06—W),着重叙述该仪表的工作原理和特点。     

Properties of Single Mode Polymer Optical Fiber

The density, dynamic modulus, Young‘s modulus, tensile strength, extension properties, Fourier transform infrared spectrum and differential scanning calorimetry have been measured and discussed for single mode polymethyl--methacrylate optical fiber. The results show that the fiber can provide large strain range for polymeric optical fiber Bragg gratings.     

Fabrication of Polymer Nonlinear Directional Coupler by Photo—bleaching

The preparation of a nonlinear directional coupler in polymer PMMA/DRl film by photobleaching is studied.We find it easier to obtain a required coupling length by controlling photo-bleaching time than by controlling the dimension of the coupler.The transmittance of each arm is measured when the pulse input light energy changes in our experiment.The experimental results show that the coupling length will change with the intensity of input light due to optical nonlinearities of the polymer PMMA/DRl at 1064 nm.     

毫秒有机聚合物薄膜全光开关

用聚甲基丙烯酸甲酯(PMMA)和偶氮染料DRl以一定的比例混合，制成各向同性均匀薄膜样品。用经斩波器调制的线偏振氩离子激光(514nm，CW)作用样品产生光致双折射。作为探测光的线偏振氦氖激光(633nm，CW)经过样品，在与其原来偏振方向垂直的检偏器后的透射光强强度受控制光的调制作用，实现了光控光的全光开关效应。通过改变控制光的光功率及薄膜样品的温度。对样品的开关响应速度和开关调制深度进行了研究。在一定的实验条件下，用毫瓦量级的控制光功率实现了几个毫秒的开关响应速度和60％以上的开关调制深度。     

聚合物光纤光谱特性研究

本文根据不同的精度要求,采用CCD光谱仪和高精度光谱仪测量了聚合物光纤的光谱损耗、吸收谱与发射谱,分析了这几种光谱特性,讨论了有源聚合物光纤中的拉曼谱对荧光谱的影响等现象。