At present, holograms are still recorded by the holographic plate in holography experiment of the college physics experiment. But the holographic plate has some disadvantages, such as costing a lot, long exposure time, poor stability, needing chemical wet processing, and not easy to save and so on. To solve these problems, the digital holography technology is proposed to improve the holography experiment. This technology is using CCD to replace the holographic plate as a recording medium, and through the computer storage, digital image processing, reconstruction algorithm and other means to achieve the digital holographic reconstruction. The results show that, the digital holography is well done, the process is fast and convenient, and the reconstruction image is clear and vivid. What's more, the quantitative measurement can be realized.%目前大学物理实验中的激光全息照相实验还在使用全息干板来记录全息图。针对全息干板具有消耗大，曝光时间长，稳定性差，需要化学湿处理，不易保存等缺点，本文提出了采用数字全息技术来进行改进，即利用CCD来代替全息干板作为记录介质，并通过计算机存储、数字图像处理、算法再现等手段来实现被拍摄物体三维形貌的数字全息再现。实验结果表明，数字全息技术很好地改善了普通干板全息照相的不足，实验过程快捷方便，实验结果清晰生动，能够实现量化测量。
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