介绍了一种基于光学原理存储和恢复多幅图像的方法。利用不同旋转角和槽型角的闪耀光栅分别对多幅灰度图像进行编码，将所有被调制图像叠加并存储到一个纯位相光学元件中。将该位相元件的位相分布经计算机输入到空间光调制器(SLM)上，用于调制入射激光光束。利用透镜对被调制光束进行傅里叶变换，光阑在频域对衍射光斑进行筛选和过滤，再通过透镜恢复图像，由CCD记录恢复的图像。实验结果显示本方法可实现22幅图像信息的高质量存储和恢复，且具有图像存储信息量大、操作简便、易于加密等优点。

A technique for image storage and reconstruction based on the superposition of multiple grating-modulated images is experimentally introduced. Blazed gratings with different groove orientations and groove angles are used to superpose many gray-scale images into a single phase element. In the experiment, the phase distribution of the superposed images is loaded onto a spatial light modulator (SLM) with a computer to modulate the incident beam. The laser beam is then Fourier transformed by a convex lens. A pinhole is used to filter the desired diffraction spot of an image in the frequency domain. Another convex lens is used for image reconstruction, and a CCD camera is used to record the reconstructed images. The experimental results demonstrate that 22 gray-scale images can be stored in a phase element and reconstructed with high fidelity. The method has advantages such as high-volume data storage, easy implementation, high security, and so on.