Development of three-dimensional display devices using color holography and its applications

1.用狭缝记录的反射全息图具有独特的特点，即使在离全息图很远的地方，再现像也是清晰的，而且是单色的。再现图像的颜色在全息图上的变化取决于观察者的位置。用CIE色度图分析了颜色的变化，发现在通常的观察条件下，颜色变化很小，得到了清晰的彩色图像。这一结果得到了实验的证实.利用全息图CAD工具进行全息光学元件的设计。介绍了利用全息图CAD工具进行全息光学元件的优化设计。我们开发的工具专门用于设计全息图。作为一个例子，全息透镜，其波长是不同的，在其记录和重建，设计。在这种情况下，重构波包含像差。用计算全息图补偿像差，获得衍射极限成像。实验验证了CAD工具的有效性，并设计了光纤通信用波长分波器，实验结果表明，该分波器具有效率高、像差小的特点，且记录实现简单.全息图在显示系统中的应用我们提出了一种平视显示系统，在该系统中，液晶显示器的图像成像在全息屏幕上，使用曲面反射镜作为所设计的器件的应用。在实验中获得了离全息图50 cm处清晰的再现像。我们提出了一个HOLD-FACTORY的方案作为后续的研究，其中全息图是通过信息网络设计和制作的。

1. Analysis of color reproduction of the reconstructed imageThe reflection hologram recorded by using a slit has unique features that the reconstructed image is sharp and mono-color even the image is disposed far apart the hologram. The color of the reconstructed image is changed across the hologram depends on the position of the observer. The change of the color was analyzed using CIE chromaticity diagram and we found that the change is quite small within the usual observation condition and sharp color image is obtained. The result has been confirmed by the experiment.2. Design of the holographic optical elements using the hologram CAD tool.Optimization of holographic optical elements by using the hologram CAD tool was demonstrated. The tool, which we have been developed, is specialized to design holograms. For an example a holographic lens, whose wavelengths are different in its recording and reconstruction, was designed. In this case, the reconstructed wave contains aberrations. The diffraction limited imaging is obtained by compensating the aberration with computer generated hologram. The experiments verified the validity of the CAD tool.We also designed the wavelength demultiplexer for optical fiber communication and showed that the demultiplexer with high efficient and small aberration is obtained with simple recording arrangement.3. Application of the hologram to display systemWe proposed the head up display system in which the image of the liquid crystal display is imaged on the holographic screen using the curved mirror as the application of the designed device. The sharp image reconstructed at 50cm apart from the hologram was obtained by the experiment.We have a plan of HOLD-FACTORY as the following study, in which the holograms are designed and fabricated through the information network.