An Updatable Holographic Display for 3D Visualization
An Updatable Holographic Display for 3D Visualization
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DOI：
10.1109/jdt.2008.2001574
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发表时间：
2008-12-01
影响因子：
--
通讯作者：
Peyghambarian, Nasser
中科院分区：
文献类型：
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作者：
Blanche, Pierre-Alexandre;Tay, Savas;Peyghambarian, Nasser
在产生三维图像的各种方法中，全息照相术占有特殊的地位。事实上，全息图可以提供高度逼真的3D图像，具有大视角能力，无需特殊眼镜。这些特性使它们成为医疗、工业、军事和娱乐成像等广泛应用的宝贵工具。为了适用于可更新的全息显示器，材料需要具有高衍射效率、快速写入时间、数小时的图像持久性、快速擦除能力以及大显示区域的潜力--这些属性的组合以前没有实现。目前，存在几种用于记录全息图的介质，例如光聚合物、银膜或重铬酸盐明胶等。但是，在所有这些介质中，映像都是永久写入的，无法刷新。还存在基于声光材料、液晶或微机电系统（MEMS）的动态3D显示系统，然而它们依赖于限制其图像尺寸能力的大量波前计算。用于全息图记录的无机晶体，例如光折变晶体，极难生长到体积大于几立方厘米。光折变聚合物是一种动态的全息记录材料，可以更新图像。在过去的十年中，它们已经被研究，并具有广泛的应用，包括光学相关，通过散射介质成像，和光通信。在这里，我们报告的第一个可更新的全息3D显示的光折变聚合物的基础上实现的细节。这是迄今为止最大的光折变3D显示器，尺寸为4 x 4 in（2），能够每隔几分钟记录和显示新图像。全息图可以观看几个小时而不需要刷新，并且可以在需要时完全擦除和更新。
Among the various methods to produce three-dimensional (31)) images, holography occupies a special niche. Indeed, holograms provide highly realistic 3D images with a large viewing angle capability without the need for special eyewear. Such characteristics make them valuable tools for a wide range of applications such as medical, industrial, military, and entertainment imaging. To be suitable for an updatable holographic display, a material needs to have a high diffraction efficiency, fast writing time, hours of image persistence, capability for rapid erasure, and the potential for large display area-a combination of properties that has not been realized before. Currently, there exist several media for recording holograms like photopolymers, silver halide films or dichromated gelatin, to name a few. However, in all of these media, the image is permanently written and cannot be refreshed. There also exist dynamic 3D display systems based on acousto-optic materials, liquid-crystals or microelectromechanical systems (MEMS), however they rely on massive wavefront computations that limit their image size capability. Inorganic crystals for hologram recording such as photorefractive crystals are extremely difficult to grow to larger than a few cubic centimeters in volume. Photorefractive polymers are dynamic holographic recording materials that allow for updating of images. They have been investigated over the last decade and have a wide range of applications including optical correlation, imaging through scattering media, and optical communication. Here, we report the details of the achievement of the first updatable holographic 3D display based on photorefractive polymers. With a 4 x 4 in(2) size, this is the largest photorefractive 3D display to date and is capable of recording and displaying new images every few minutes. The holograms can be viewed for several hours without the need for refreshing, and can be completely erased and updated whenever desired.