使用民用CCD对体全息存储图像分辨率的研究

Study on the Resolution of Image Retrieved from Volume Holographic Memories

全息存储图像重构所达到的分辨率是评价存储器性能的重要指标。本文利用民用CCD和图像处理技术对不同全息图直径和衍射光功率下的重构图像分辨率进行了定量的研究。发现实际存储时采用3mm的全息图直径较为合适，并在此基础上估算了角度复用所能达到的最大存储密度。

The resolution of images retrieved from a holographic memory is a key performance of the memory. In this paper, the image resolution of volume holographic storage is studied by using a common CCD camera and image processing techniques. The relationship between the resolution of practically retrieved images and hologram sizes is obtained.The minimum diffractionpower required for our CCD without loss of the resolution of retrieved image is measured. We find that for our experiment system the reference beam with diameter of 3 mm is most suitable to store and retrieve the images in terms of high density. On this basis, the maximum storage density in angular multiplexing is estimated.