预置狭缝法彩虹全息图视角的理论分析

Theoretical Analysis of the View-angle of Rainbow Holograms Recorded Using a Pre-existent Slit

对用预置狭缝法和带平面反射镜的预置狭缝法制作的彩虹全息图的视角问题作了详细的讨论。提出了既可以保证能量利用率,又可以进一步扩大再现视角的简单方法——斜放平面反射镜的预置狭缝法。对平面镜的最佳位置及所能具有的最大视角进行了分析和讨论,给出了相应的计算公式。讨论了上述几种方法的使用条件及所受限制,并比较了在某些情况下各自的最大视角。另外定义了有效再现狭缝的概念。

The view angle of rainbow holograms which are recorded using a pre existent slit or a pre existent slit with mirrors is analyzed in detail. Then a simple method using a pre existent slit with inclined mirrors is suggested. This method can extend the view angle of the rainbow hologram further, while keeping a high energy efficiency of the rainbow hologram. The best position of the mirrors and the possible biggest view angle of the hologram is studied and the relative formulas are given. Requirements and restriction of using the three methods are considered and their biggest view angles are compared. A concept on efficiency reconstruction slit is proposed, so as to distinguish it from the normal reconstruction slit.