光折变聚合物材料的研究进展

本综述了光折变聚合物材料的发展历史和现状。概括出了这种新型光折变材料的发展思路,并汇总了各种类型材料的光折变特性参数。     

光折变聚合物材料的研究进展

本文综述了光折变聚合物材料的发展历史和现状。概括出了这种新型光折变材料的发展思路 ,并汇总了各种类型材料的光折变特性参数。     

光折变聚合物中的小振幅空间光孤子

给出了稳态条件下光折变聚合物中的小振幅空间孤子的演化方程,得到了方程的暗、亮孤子解析解,并且给出了小振幅聚合孤子的宽度表达式结果表明,光折变聚合物中存在着双曲正切形式的小振幅暗空间孤子和双曲正割形式的小振幅亮空间孤子,小振幅聚合孤子的宽度与外加电场成反比关系.     

光折变聚合物中的小振幅空间光孤子

给出了稳态条件下光折变聚合物中的小振幅空间孤子的演化方程,得到了方程的暗、亮孤子解析解,并且给出了小振幅聚合孤子的宽度表达式结果表明,光折变聚合物中存在着双曲正切形式的小振幅暗空间孤子和双曲正割形式的小振幅亮空间孤子,小振幅聚合孤子的宽度与外加电场成反比关系     

全功能型有机光折变材料的研究进展

本文综述了全功能型光折变聚合物和小分子材料的研究进展，并详细汇 总了这种材料的热特性，光电和电光特性，及光折变特性参数。基于对材料从分子水平上的设计思想，阐述了这种光折变材料的发展思路。     

光折变聚合物中的小振幅空间光孤子(英文)

给出了稳态条件下光折变聚合物中的小振幅空间孤子的演化方程,得到了方程的暗、亮孤子解析解,并且给出了小振幅聚合孤子的宽度表达式。结果表明,光折变聚合物中存在着双曲正切形式的小振幅暗空间孤子和双曲正割形式的小振幅亮空间孤子,小振幅聚合孤子的宽度与外加电场成反比关系。     

光折变有机聚合物中的空间孤子

给出了稳态情况下光折变聚合物中光波演化方程的亮、暗及灰孤子解,并讨论了不同孤子态的偏振特性及孤子宽度与外加电场的关系. 关键词： 光折变 聚合物 空间孤子     

光折变材料的带隙结构研究

利用光子晶体的概念和时域有限差分方法计算了当光折变材料的空间折射率呈一维正弦变化时其内部的带隙结构情况,表明在光折变材料中存在极窄的光子带隙。最后讨论了折射率(n)、折射率调制幅度(△n)、周期长度(D)及周期数(N)对光子带隙的影响。     

有机光折变材料的新进展

有机光折变材料是近几年新出现的光电功能材料，在各各光电子信息处理领域具有广泛的应用前景，如高精密光学数据存储、光学图像处理、相位共轭镜和激光器、动态全息、光计算和图形识别等。文章回顾了近几年中新兴的、有希望的光折变聚合物材料领域的最新进展及其在可重写全息信息存储中的应用。     

DMNPAA有机光折变材料的性能研究

通过双波耦合实验证明在一种新的有机聚合物光折变材料中双波耦合增益系数超过吸收系数。１０５μｍ厚的样品衍射效率可达到８６％，光栅形成的响应时间达到１００ｍｓ量级，双波耦合增益系数超过了２００ｃｍ＾－１（１），并引入了一种新的方法分析了其光折变机理。     

Performances of an all-optical subtracted joint transform correlator that uses a photorefractive crystal

An all-optical subtracted joint transform correlator (JTC) was proposed and it was experimentally shown that the correlator successfully performs the pattern recognition with the number of reference patterns. In the correlator, an optical interferometer was introduced to remove the additional correlation signals between the reference patterns themselves from the output plane and a photorefractive crystal was also introduced to record the joint power spectra as volume holograms. The processing for removing the additional correlation signals was performed by the parallel computations in the interferometer in real time. In this study it has been found that the correlator yields significantly better correlation results than the classical joint transform correlator does and the recording of the volume hologram corresponds to a nonlinear processing of the joint power spectrum in the fringe-adjusted joint transform correlator. However the volume hologram has angular selectivity for matching the Bragg condition. It would restrict the shift-invariant area of the input image plane. This restriction has been investigated experimentally.     

外加电场光折变有机聚合物串联回路中独立空间孤子对

对外加电场光折变有机聚合物串联回路中独立空间孤子对进行了理论研究,导出了在光折变有机聚合物串联回路中两光束传播的耦合方程,证明了串联回路中存在暗-暗、明-暗和明-明三种独立空间孤子对.在光束的空间展宽远小于有机聚合物宽度的极限条件下,暗-暗孤子对之间孤子入射光强的改变可相互影响到对方的包络和动态演化.对于明-暗孤子对,暗孤子通过光电流能影响明孤子,但明孤子不能影响暗孤子.明-明孤子对之间没有影响. 关键词： 非线性光学 光折变效应 光折变聚合物 空间孤子对     

LD相对于铯原子超精细跃迁线的偏频锁定

Holographic storage properties of iron-doped and cerium/iron-doped LiNbO3 with different doping concentrations and treatment conditions have been measured for different recording wavelengths. The results show that at recording wavelengths of 532 nm and 633 nm the holographic storage properties of Ce:Fe:LiNbO3 are generally better than those of Fe:LiNbO3.     

The Comparison of the Holographic Storage Properties of Fe:LiNbO3 and Fe:Ce:LiNbO3 Crystals

Holographic storage properties of iron-doped and cerium/iron-doped LiNbO3 with different doping concentrations and treatment conditions have been measured for different recording wavelengths. The results show that at recording wavelengths of 532 nm and 633 nm the holographic storage properties of Ce:Fe:LiNbO3 are generally better than those of Fe:LiNbO3.     

基于全息聚合物分散液晶的有机二维光子晶体激光器的研究

采用一次性曝光光路制备了基于全息聚合物分散液晶的亚微米周期染料掺杂二维光子晶体,晶格常数为582nm.选取4-(二氰亚甲基)-2-甲基-6-(4-二甲氨基苯乙烯基)-4H-吡喃作为激光染料,利用输出波长为532nm的Nd:YAG倍频脉冲激光器作为抽运光源对染料掺杂二维光子晶体进行抽运,得到了中心波长为627.4nm的窄线宽、低阈值的输出激光,激光线宽为0.4nm,阈值能量约为22.7 μJ.与目前国外的报道相比,激光线宽和阈值能量都有了很大幅度的降低.将其与基于一维光栅的分布反馈式激光器相比,线宽从1.4 关键词： 全息聚合物分散液晶 二维光子晶体激光器 带隙结构 阈值能量     

The Comparison of the Holographic Storage Properties of Fe∶LiNbO_3 and Fe∶Ce∶LiNbO_3 Crystals

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Manakov solitons in biased photorefractive polymer

The coupled equations for the incoherently coupled soliton pairs in biased photorefractive polymer are provided. It is shown that the coupled soliton equations reduce to Manakov equations when the total intensity of two coupled solitons is much lower than the background illumination. The bright-bright, dark-dark, and grey-grey soliton pair solutions of these Manakov equations are obtained, and the characteristics of these Manakov solitons are also discussed.     

主客体式光折变聚合物中空间明孤子的动态演化特性

研究了主客体式光折变聚合物中空间明孤子的动态演化特性,讨论了振幅微扰和宽度微扰对其传播特性的影响.结果表明,入射波为明孤子波时,能够在聚合物中稳定直线传播 在较小微扰情况下,孤子波经短距离传播后能够演化为明孤子波 当微扰比较大时,光波不能在聚合物中稳定传播,而是呈现周期性震荡现象 关键词： 光折变效应 光折变聚合物 空间孤子     

CRT－LCLV and photorefractive crystl BSO based real－time joint transform correlator

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Separate holographic screening soliton pairs in a biased series photorefractive crystal circuit

Holographic dark (bright) screening solitons are predicted in one dimension for a series circuit consisting of two photorefractive crystals connected electronically by electrode leads in a chain with a voltage source. Each crystal can support a holographic screening soliton. The two solitons are known collectively as a separate holographic screening soliton pair with three types: bright--bright, bright--dark and dark--dark. The numerical results show that the two solitons in a soliton pair can affect each other through a light-induced current and their coupling can affect their spatial profiles under the limit in which the optical wave has a spatial extent much less than the width of the crystal.