显示全息图像的噪声和衍射效率

The noise and diffraction efficiency of display hologram

较全面地讨论了全息噪声产生的各种来源和抑制办法。指出在拍摄全息时 ,一般总希望提高衍射效率。但应依据拍摄对象来选择参物比 ,以求得总的衍射效率和整体效果最佳。在考虑到外部环境的影响时 ,拍摄时间不宜过长。在一定的条件下 ,为了获得最佳的效果 ,存在着一个最佳曝光时间的问题。还报道了在电镜观察下 ,记录材料的分辨率不够时 ,干涉条纹的信息将破坏 ,并讨论了与此有关的问题。

The origins of various holographic noises and methods for restricting noises are discussed in the paper.While making hologram,the contrast of interference fringes is supposed to be increased in order to increase the diffraction.In order to obtain optimum diffraction efficiency and whole result,the ration of reference light and object light is chosen different with objects.In consideration of external environment,the exposure time should not be too long.In a certain condition,there is an optimum exposure time.Under the observation of electronic micrograph,it is shown that the information of interference fringes will be destroyed if the resolution of the recording materials is not high enough.Finally,some related problems are discussed.