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 ,能够获得均匀的衍射效率 A new method of recording double-sided alternating photorefractive multi-memory is proposed. Using the characteristic that the refractive index grid moves in the recording crystal during readout, the refractive index grids of different holograms are placed in the longitudinally separated positions in the crystal to utilize the refractive index dynamic range of the entire recording crystal to the maximum extent, and improve the photorefractive The actual storage density for multiple storage. In the double-sided alternate writing, the first-written index grid is placed in the center of the recording crystal, and the two last-written index gratings are placed in the vicinity of the front and rear surfaces of the recording crystal to obtain a uniform diffraction efficiency