一种提高光折变多重存储密度的记录方法

A novel method for high density potorefractive multiplex holograms recording

提出了一种新的双面交替写入了光折变多重存储的记录方法。利用读出时折射率栅在记录晶体中移动的特点 ,把不同全息图的折射率栅置于晶体中纵向分离的位置 ,最大限度的利用了整个记录晶体的折射率动态范围 ,提高了光折变多重存储的实际存储密度。双面交替写入是把最先写入的折射率栅置于记录晶体的中心 ,最后写入的两折射率栅置于记录晶体前后表面附近 。

A new method for photorefractive multiplex hologram record was proposed.Making use of the propagation in z direction of grating envelope during readout,different holographic graings of multiplexed holograms were placed in different positions along z direction.thus,the dynamic range of index in all recording media was used,resulting in high storage density.A double sides record method was used to mount the first holographic grating in the center and the last two near the surfaces of the recording crystal,obtaining a uniform dffraction efficiency.