利用栅增强技术提高光折变多重存储衍射效率

Study on high diffraction efficiency of multiplex holograms recording method using grating enhancement and fixing

提出了一种结合折射率栅自增强读出和固定技术的光折变多重存储的记录方法。利用自增强读出时折射率栅在记录晶体中（ｚ向）移动的特点，把同一位置记录的不同全息图的折射率栅置于晶体中ｚ方向分离的位置，最大限度的利用了晶体各处的折射率的最大动态范围，提高了多重存储衍射效率。

A new method for photorefractive multiplex hologram record was proposed,which combines the enhancement properties and the fixing technique of holographic grating.Making use of the propagation in z direction of grating envelope during readout,different holographic gratings of multiplexed holograms were placed in different positions along z direction and fixed.Thus,the dynamic range of index in all recording media was used,resulting in high diffraction efficiency.