新型双染料敏化的宽带光聚物全息特性研究

报道了一种新型、两种染料共同敏化的宽带响应光聚物材料.该材料使用孟加拉玫瑰红和亚甲基蓝作为联合光敏剂，由于混合染料的加入，使材料的感光光谱范围大大加宽.用四种波长的光对样品进行曝光，衍射效率均大于40%，最高可达80%，适合于多波长存储，分别用不同波长的激光在样品同一位置存储了四幅不同的图像，其再现图像效果良好，表明该材料是一种较理想的多波长全息存储材料.     

作为光存储材料的有机光致聚合物材料研究进展

本文综述了光致聚合物的光化学反应和动力学基本原理 ,讨论了影响光聚物光存储性能的各个因素 ,对近几年光致聚合物材料的发展状况和光聚物在光全息存储方面所具有的巨大潜力进行了论述     

作为光存储材料的有机光致聚合物材料研究进展

本综述了光致聚合物的光化学反应和动力学基本原理,讨论了影响光聚物光存储性能的各个因素,对近几年光致聚合物材料的发展状况和光聚物在光全息存储方面所具有的巨大潜力进行了论述。     

一种全可见光敏感的光致聚合物全息特性研究

制备了一种对整个可见光波段都敏感的光全息存储材料,并研究了该材料的透过率、衍射效率、灵敏度等全息特性.用He-Ne激光器633 nm和Ar+ 激光器514 nm,488 nm,476 nm四种波长的光曝光,材料的饱和衍射效率最大为66%,最小为48%;最高灵敏度为8.06×10－3 cm2/mJ.最高折射率调制度为4.22×10－4.用多波长存储时,不同波长的光可存储多幅全息图,且再现图像清晰.结果表明,该材料是较好的高密度数字全息存储材料.     

多种单体的全息光聚物材料组分的优化

报道了一种以丙烯酰胺为单体的光致聚合物材料。通过对组成材料的三乙醇胺（TEA）、丙烯酰胺（AA）和亚甲基双丙烯酰胺（BAA）浓度的优化实验发现，三乙醇胺浓度有一个最佳值，当保持亚甲基双丙烯酰胺与丙烯酰胺的浓度比为1：6时，材料中丙烯酰胺的浓度达到0.25mol/L后，衍射效率便达到最大值，材料的灵敏度随着丙烯酰胺的增加而不断地提高，在光聚物介质上能够记录信噪比较高的图像，说明该材料适全于大容量体全息存储。     

物光参考光同光轴的体全息存储光学系统设计

将两块漫射板分别置于输入面的两侧,使物光和参考光同光轴,可以使体全息存储傅里叶变换光学系统更为紧凑。然而,在这种全息存储光学系统中,物光和参考光的总数值孔径较物光数值孔径大很多。分析这种体全息存储光学系统物光和参考光光路的设计要求和光学参量的确定;采用多重结构方法对物光正向光路、逆向光路和参考光光路同时优化设计,实现对物光光路二对物像共扼位置控制像差,并满足参考光光路的要求;给出前后组焦距分别为33 mm和30 mm的物光和参考光同光轴,前工作距为30 mm,物光和参考光总数值孔径为0.53的全息存储光学系统的设计结果。系统的波像差小于0.071λ,达到衍射极限。     

光折变聚合物材料在光电子技术中的应用

光折变聚合物材料与光折变晶体相比，其非线性光学系数大，响应时间快，成本低廉，制备灵活，有可能成为制作光子学集成器件的材料。简要介绍了光折变聚合物材料在图像识别、光信息存储及光学相干层析技术等方面的应用情况，指出光折变聚合物材料中存在光子带隙。最后预测了光折变聚合物材料作为光子晶体在光子学器件中的应用前景。     

光聚物全息光盘记录方法和光路的优化

提出了适用于光聚物厚膜盘状高密度全息存储的角度空间复用相结合的存储方法。研究了光路设置对记录容量和密度的影响 ,分析和计算表明 :对全息光盘光聚物全息存储介质来说 ,新方法可以获得比空间角度复用存储方法高近一个数量级的存储容量和密度 ,当使用平面波做参考光、介质内参物光入射角度在 32°时是获得最大存储容量和密度的最佳设置 ;对 5 0 0 μm厚的光聚物介质 ,存储密度可达到 42bit/ μm2 ,用CD ROM同样大小的全息光盘 ,在其相同的有效记录面积上 ,其总容量可以达到 40 0Gbit,表明新方法是实用化光聚物盘状全息存储比较理想的方法。     

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。     

持续光谱烧孔和三维光信息存储

持续光谱烧孔（Ｐｅｒｓｉｓｔｅｎｔ ｓｐｅｃｔｒａｌ ｈｏｌｅ ｂｕｒｎｉｎｇ）简你 ＰＨＢ．将 ＰＨＢ应用于光信息存储，可以使光的频率成为新的存储维，将传统的二维（ｘ，ｙ）光信息存储发展成为三维（ｘ，ｙ，ｖ）光信息存储．与目前的光盘系统（记录密度限为．１０８ｂｉｔ／ｃｍ２）相比较，ＰＨＢ的三维光信息存储（以下简称ＰＨＢ存储）在理论上可以使记录密度提高三至四个数量级．本文介绍了ＰＨＢ和ＰＨＢ存储的基本原理，ＰＨＢ材料及其研究现状．     

番红花红T敏化的新型光致聚合物全息存储材料

制备了一种以番红花红T为光敏剂的新型全息存储材料,实验结果表明,该材料具有较高的衍射效率、曝光灵敏度和较大的折射率调制度等,最大衍射效率约38.5%,折射率调制度为0.547×10－3,在存储介质膜中存储了模拟全息图像,再现图像有较好的保真度,说明该材料适合用作高密度体全息存储介质。     

基于丙烯酰胺为单体的红敏光致聚合物衍射效率增强的研究

目前以丙烯酰胺为单体的光聚物体系在高分辨力下衍射效率不高。从光聚物聚合机理出发．探讨了其主要原因。从单体聚合难易程度角度提出了加入新成分丙烯酸、使用聚合度低的成膜物、增加膜的厚度和优化凉板时间等四种促进单体聚合的措施并从实验上加以了验证。结果表明：在一定条件下。成膜物使用聚合度为341的聚乙烯醇比聚合度为1750的聚乙烯醇体系衍射效率提高了约60％;加入丙烯酸后衍射效率也提高了10％左右,且使用聚合度低的成膜物和加入丙烯酸后体系更不易结晶;厚度和凉板时间均有一个最佳范围。经过优化实验后得到了空间频率在2000lp／mm时衍射效率大于90％,3000lp／mm时大于55％的结果,且利用制备出的材料拍摄出透射和平面反射全息网,说明该材料适合于日益发展的全息显示。     

Holographic recording in a photopolymer by optically induced detachment of chromophores

We demonstrate holographic recording in a new photopolymer system. The recording material is created by copolymerization of an optically inert monomer, methyl methacrylate, and a second monomer that is optically sensitive. On exposure of the recording material to light, a portion of the optically sensitive component detaches from the polymer matrix and causes hologram amplification through diffusion of the free molecules. We measured postrecording grating amplifications as high as 170% by this process. The recorded holograms are persistent at room temperature under continuous illumination at the recording wavelength.     

Reflection mode holographic recording in methylene blue-sensitized polyvinyl alcohol acrylamide films

Photopolymer systems can produce good image quality holograms that does not require any post-processing and are environmentally stable with good diffraction efficiency. The present work reports the development of a methylene blue-sensitized polyvinyl alcohol acrylamide (MBPVA/AA) photopolymer system for recording white light reflection holograms. Reflection gratings were recorded in the photopolymer films with different concentrations of methylene blue (MB). Various parameters affecting the holographic properties of the samples were also studied. The holographic performance of the material is found to depend on its chemical composition and the recording parameters.     

多路角度复用体全息三维显示技术

为满足高分辨率真三维大数据显示的空间带宽积要求,提出一种基于多通道角度复用模式的体全息三维显示技术。通过对三维场景进行波前编码,获得相位计算全息图,并将计算全息图依次按照不同角度复用记录到掺杂金纳米颗粒体全息光致聚合物材料的同一区域,获得复用体全息图,再现时可以在不同角度观察三维场景。在体全息三维显示实验系统中,实现体全息材料记录区域的单点像素总数为120×1 920×1 080,显示的空间带宽积达到了2.5×108,相对于空间光调制器显示提升了120倍。     

Hologram multiplexing in acrylamide hydrophilic photopolymers

Unslanted diffraction gratings are recorded in a 900 μm thick acrylamide photopolymer by means of peristrophic multiplexing. A solid state Nd:YAG (λ = 532 nm) laser is used as the recording beam, with a total incident intensity of 5 mW/cm², and a He-Ne laser as the reconstruction beam. The dye concentration in the photopolymer is optimized so that it does not limit the dynamic range. Nine holograms are recorded using constant exposure time scheduling and variable exposure time scheduling. From the results obtained it may be deduced that optimization of the dye allows us to work in the linear response region of the photopolymer and at the same time obtain high values of diffraction efficiency for each hologram. An exponential increase in exposure time as the number of holograms increases enables the values of diffraction efficiency to be homogenized with regard to the case of constant exposure scheduling. In this way, better use is made of the dynamic range of acrylamide hydrophilic photopolymer.     

Evaluation of polycarbonate substrate hologram recording medium regarding implication of birefringence and thermal expansion

In this paper, we evaluate photopolymer media using a polycarbonate (PC) substrate. In holographic data storage medium, substrates that sandwich the photopolymer material are needed to protect the photopolymer material against exogenous shock and open air. An optical glass such as BK-7 is normally used as a substrate, but a PC substrate has a cost advantage and is easy to fabricate compared with optical glass. For holographic recording and reading, however, the high birefringence and high thermal expansion of a PC substrate are significant problems. First, we analyze the degree of degradation of output power by the polarization change and estimate the threshold value of birefringence to record hologram normally. Next, we estimate the temperature tolerance of hologram readout with polycarbonate substrate hologram medium. These analyses results indicate the possible usage of the PC substrate as holographic recording media.     

Phenanthrenequinone-doped poly(methyl methacrylate) photopolymer bulk for volume holographic data storage

We present the design and fabrication of a phenanthrenequinone-doped poly(methyl methacrylate) photopolymer material. Large blocks of samples were made, and the material showed negligible shrinkage after optical exposures. We recorded and reconstructed 250 holograms at a single spot, using a 1-cm(3) block.     

Study of effective optical thickness in photopolymer for application

The impact of the effective optical thickness of a photopolymer on its holographic performance was studied. To overcome the attenuation of gratings for a better uniformity, a multilayer approach was introduced, by adjusting concentrations of dye along the depth of photopolymer to compensate the attenuation of recording light due to absorption. Multilayer photopolymers with thicknesses over 500 μm were designed, fabricated, and characterized experimentally, exhibiting better Bragg selectivity. More holograms were stored in multilayer material by angular multiplexing, and the cumulative grating strength was enhanced, leading towards larger holographic storage capacity.     

在光致聚合物中采用脉冲激光记录全息图的记录条件研究

在蓝绿敏光致聚合物材料中,用532 nm激光器作为光源,在等光强不同重复频率和等重复频率不同光强条件下分别进行全息记录,用红光进行动态读出,获得两种记录条件下的衍射效率曲线.实验结果表明,在近连续脉冲光下进行全息记录时,较低重复频率和较低光强的脉冲激光能够明显提高光致聚合物光栅的最高衍射效率,通过优化脉冲激光的重复频率和平均光强,可以在材料中记录衍射效率最高的全息图.