摘要
提出一种利用纯位相计算全息图实现光学安全和防伪方法。这种方法将记录相息图时在全息图面上对应的位相分解成两部分 ,分别制成两张纯位相计算全息图。单独再现每一张全息图时无法观察到原物体信息 ,而将两全息图对准合在一起时 ,则可在计算全息图的观察面上得到原来的物体信息。可以将其中的一张全息图作为解码标准 ,从而依据是否可以与之共同解出某一特定的信息来判断全息图的真伪。
An anti counterfeiting means using phase only CGH is presented in this paper. Two phase only CGHs are made by decomposing the phase information into two parts. When single CGH is reconstructed, no information will be observed, while two alignment combined phase only CGHs are reconstructed, the recorded information will be read out on the image plane. Any one of the CGH can act as the decoding key. Because the phase distribution on each CGH is a random one, it is very difficult to duplicate the identical decoding CGH.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2000年第7期645-648,共4页
Chinese Journal of Lasers
基金
四川大学青年科研基金资助项目
关键词
纯位相
全息图
光学安全
位相函数
phase only CGH, anti counterfeiting, optical security
