摘要
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。
The phase hologram is gained by varying refraction index(both the bleaching silver plate orD.C.G plate)There are smaller phase modulations in these plates,So it isn’t possible to generateover-modulation,We can choose shoting parameters widely,In order to get high diffraction efficiency,we must improve the refraction index n1 of phase modulation caused by interference term. When the reflection hologram is weak Bragg-diffraction,the monochromaticity of reconstructedimage has changed bad and there is a transmitting image.
出处
《光子学报》
EI
CAS
CSCD
1995年第5期464-467,共4页
Acta Photonica Sinica
关键词
相位调制
折射率
全息图
衍射效率
Refraction index of phase madulation
Over-modulation
Over-exposure
Monochromaticity
