基于波的耦合理论，给出了实际写入光折变晶体中光栅振幅的空间分布函数，通过数值解耦分析了单光束读栅和双面交替读栅时全息光栅的增强特性。提出了一种易于实现双面交替读栅增强衍射效率的存储结构，此结构中包括一个存储晶体和一个动态全息刷新器，给出了实现栅增强的最佳结构参数

The spatial distribution function of grating amplitude recorded in photorefractive crystal based on the couple-waves theory is given. The enhancement properties of holographic grating readout by single-beam and by double-side alternative readout are analyzed after solving the couple-equations numerically. A storage architecture, which includes one crystal and a dynamic holographic refresher (DHR) easily enhanced diffraction efficiency by double-side readout is presented. Meanwhile the optimal architecture parameters to realize the grating enhancement are also given.