用全息元件实现变形分数傅里叶变换

Implementaion of Anamorphic FRT Using HOE

提出用全息元件实现变形分数傅里叶变换 .用全息方法制作在两个方向上具有不同焦距的变形柱透镜 ,且两方向上的焦距可随全息元件记录条件不同而改变 .用此元件实现了在不同方向上具有不同阶的变形分数傅里叶变换 ,讨论了用全息元件实现这种变换的条件 .并提出用此元件构成一种新的光学安全认证系统 。

Implementation of anamorphic FRT using HOE is presented. A holographic anamorphic cylindrical lens, which has different focus length along two perpendicular directions, is made. The focus length in different direction is able to change according to the conditions of the recording procedure. FRT with different fractional order along the different direction can be realized using this HOE. The condition to realising FRT using this HOE is discussed. A new optical security system is composed based on this HOE and the experiment results are given.