激光全息技术的发展与应用

介绍了近年来国内外激光全息的新技术、新产品和新方法,分析了其中需解决的关键技术和发展趋势,以利于拓宽思路,不断进行技术创新,开创激光全息技术应用的新局面。     

图像模拟在白炽灯气体折射率全息CT测量中的应用

简要介绍白炽灯点燃过程中灯内气体折射率三维分布测量的实时全息干涉图像．根据密闭气体被灯丝加热时所涉及的物理问题建立简化的物理及数学模型．并利用数字图像处理技术对全息干涉图像的形成过程进行模拟研究。研究结果表明．当灯泡外空间的折射率变化不均匀时．灯泡投影区域内的干涉图像将同时带有灯内外气体折射率变化的信息．利用干涉图像中灯泡投影区域外干涉条纹的测量结果可以对实际测量结果进行修正。此外．根据研究结果及全息CT技术．给出了忽略灯泡外空间的折射率变化影响时白炽灯内气体折射率三维分布测量的实例。     

全息打印技术研究进展

全息打印技术可以实现场景的真三维显示,根据干涉纹样的不同来源及不同记录方式,可将其归类为合成全息体视图打印、计算全息图打印与全息波前打印。合成全息体视图打印无法准确记录三维场景的深度信息,因而全息图再现时存在会聚-调节矛盾;计算全息图打印能够准确记录与再现场景的深度信息,继而解决会聚-调节矛盾,然而仅能得到薄的透射型全息图,因而无法实现白光再现;全息波前打印既可以解决会聚-调节矛盾,又可以得到厚的反射型全息图,实现具有良好观察效果的白光再现。首先介绍了各类全息打印技术的基本原理,着重分析了各自的研究现状,然后讨论了它们的优缺点,以说明各类全息打印技术的特性。     

高分辨率多视点动态全息3D显示

提出了一种高分辨率多视点动态全息3D显示方法,观看视点位置变化时,观看者能够看到连续变化的3D效果。在进行全息图计算时,首先根据针孔阵列投影模型,渲染3D动画中每一帧3D模型的光场图像序列;然后从已渲染的多组光场图像序列中抽取对应视角信息的光场图像进行融合,得到融合后的动态光场图像序列;在进行全息图编码时,以动态光场图像序列中的一帧图像作为物光振幅,以来自于针孔的发散球面波的相位作为物光相位,引入平面参考光进行编码,得到一个单元全息图。由于每个单元全息图的计算是相互独立的,因此在计算过程中使用并行加速计算,实现了尺寸为32 mm×32 mm、分辨率为100000 pixel×100000 pixel的高分辨率全息图,其光场图像融合和全息编码的时间仅需27 min。光学再现结果证明了该方法的可行性。所提出的高分辨率多视点动态全息3D显示方法在全息包装和3D广告等领域具有广泛的应用前景。     

硬X射线全息术

介绍了硬X射线全息术的工作原理及其发展。     

全息光学元件（HOE）水平及展望

本文对目前国际上HOE的研制水平进行了概括性论述,对未来HOE的设计、制造、测试及应用的发展方向进行展望。提出用“简并相干光”记录HOE的设想,以及光学全息和计算点息技术的综合开发问题。     

计算机与光学相结合的动态彩虹全息研究

提出一种将数字全息术和传统光学全息结合的方法制作动态全息图。首先通过三维扫描仪获得实际三维物体不间姿态的物光分布数据，然后利用计算机全息技术获得高质量的二步彩虹中的主全息图H1，最后再用光学的方法得到彩虹全息图。该技术充分利用了计算全息技术的灵活性，同时解决了视角和白光再现的问题，获得了较好的实验结果。     

光栅产生带状谱的彩虹消色全息术

本文提出利用光栅产生类似多狭缝形式的带状谱获得消色像的全息记录方法,讨论了获得消色像的条件,并给出了实验结果。     

周视全息术

提出一种周视观察的半板菲涅尔和彩虹全息图的制作技术,观察方向几乎平行于全息图面.     

石油井下岩芯泊松比激光全息计算机辅助测量

应用激光全息术辅以计算机和数字化仪对油田井下岩芯泊松比进行测量,给出测量结果并进行了分析和讨论。     

全息CT测量轴对称透明体折射率变化的模拟

简要讨论了全息CT测量原理，理论上证明根据实时全息干涉图的强度分布测量待测物体折射率三维（3-D）变化的可行性；利用计算机对轴对称介质折射率变化的全息CT干涉条纹进行模拟研究，并给出模拟研究的应用实例。     

一维光栅合成似狭缝彩虹全息术

本文提出了平移光栅法实现合成似狭缝彩虹全息术。在二维透明片前放置一光栅。在曝光期间，平移光栅，这将在透镜扣焦面上产生合成似狭缝。当光栅平移量是光栅周期的整数倍时，这将可能忽略除零级以外的其余和级物频谱从而实现合成似狭缝彩虹全息术。     

Nonlinear Recording Holography Capable of Doubly Increasing Stress Pattern

When recording a hologram,we should control the.exposure amount which is in nonlinear area of the characteristic curve of complex amplitude transmittance τ～exposure H,the hologram can diffeact some higher-order diffracted photograph.The amount of diffracted order has something to do with the recording angle between object beam and reference beam,is concerned with the ship of transmission curve.The phase difference.If the phase difference increased a time,the number of diffracted fringes also increased a time,it is similar to a fringe multipler,that it is obvious to in-crease the precision of interferometry.Nonlinear recording of double exposure method is discussed,and the formula of intensity distribution of second order diffracted photogra-phy,and experimental results are given.     

Holographic Gratings in Diblock Copolymers with Azobenzene and Mesogenic Side Groups in the Photoaddressable Dispersed Phase

Diblock copolymers, consisting of a photoaddressable mesogen‐containing dispersed phase and a polystyrene matrix, have been synthesized and characterized as holographic data storage materials. The photoaddressable phase contains p‐methoxy‐substituted azobenzene side groups and benzoylbiphenyl mesogenic side groups in a statistical distribution. Three‐ring mesogenic groups in combination with photoaddressable azobenzene side groups have been introduced for the first time in block copolymers in order to increase the local refractive‐index difference between illuminated and non‐illuminated volume elements, as well as to improve the stability of the orientation, while, at the same time, decreasing the optical density. To this end, a series of block copolymers with different azobenzene/mesogen ratios have been synthesized. The light‐induced reorientation dynamics of the chromophores and mesogens and the long‐term stability of the orientation have been studied with volume holographic measurements. A remarkable increase in stability of the holographic gratings has been achieved.     

新型多层波导全息存储结构的设计

提出了一种新型多层波导全息存储结构，该结构由波导输出光栅和体全息层为单元构成，其光的衍射效率得到很大的改善，读出光的耦合效率理论上可达到50%。同时，该结构不同单元记录层的信号读出时串扰很小。有望在全息光存储、三维立体彩色显示等方面得到应用。     

激光全息双曝光法测量人体新鲜股骨皮质骨轴向泊松比

报告应用激光全息双曝光法测量人体新鲜股骨皮质骨沿长轴方向的泊松比。实验结果说明,激光全息干涉测量人体新鲜骨骼的泊松比能避免新鲜骨骼内含水份和油脂的影响。     

Measuring the Object Deformation by Real Time Holographic Interferometry with Automatically Calculating Hologram

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Ortho‐Nitrostilbenes in Polycarbonate for Holographic Data Storage

Holographic data storage materials based on dye‐doped polycarbonate that could find application in professional archival and consumer applications are described. The dyes are selected from the class of o‐nitrostilbenes, which irreversibly bleach under exposure to light and show high thermal stability before and after exposure. The reduction in concentration of the dye in the host after exposure induces refractive index variations over a wide range of wavelengths and extends well away from the dye absorption peak conforming to the Kramers–Kronig relationship. The materials are injection moldable into the standard disc format and have negligible shrinkage during data storage. Samples were produced using different dyes and various concentrations in a polycarbonate host and processed on professional CD/DVD equipment. The refractive index change is as high as 0.04, with a measured instantaneous sensitivity of 0.5 cm J^–1 and M/# = 0.3.