A new method with Pre--existent ring slit for making circular viewing hologram is presented.
在二步周视彩虹全息图制作光路中布置一块大孔径的菲涅耳螺纹透镜及预置狭缝，既可获得具有较大观察口径的周视彩虹全息图，又可大幅度提高记录时光能的利用率。
A kind of circular viewing rainbow holography on plane holographic plate is proposed, in which a ring object wave front above it is firStly divided and recorded onto n strip Fresnel holograms, then synthesized.
提出一种将物光波前先分解记录，再合成的二步平板周视彩虹全息术。
