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本文指出对于通过折射率变化来实现相位调制的全息图（无论是漂白后的银盐干版，或ＤＣＧ版），在通常情况下其相位调制度都较小，不可能发生过调制现象，故拍摄参数选择范围相对较宽。要获得高衍射效率全息照片的关健应放在如何提高干涉项引起的相位调制折射率ｎ１上。本文还指出当反射全息处於弱布喇格衍射的情况下，再现图象的单色性下降，并存在透射象。
This paper points out that in the case of a hologram (either a dried silver salt dry plate, or a DCG plate) that achieves phase modulation by a change in refractive index, its phase modulation is generally small and modulation can not occur The range of shooting parameters is relatively wide. The key to obtaining high diffraction efficiency holograms is to focus on how to improve the phase modulation index n1 caused by the interference term. It is also pointed out that when the reflection hologram is in the weak Bragg diffraction, the monochromaticity of the reproduced image decreases and the transmitted image exists.