通过化学反应，在三醋酸纤维素酯片基的正反两面同时生成具有感光活性的光敏层的方法，获得了一种具有叠层光敏性的全息记录软片:重铬酸盐一三醋酸纤维素酯(DC-TAC)。由该软片记录的叠层体积全息光栅(SVHG)，具有迄今为止，最高的一级实验衍射效率(54％)。本文给出了这种叠层体积全息光栅的制作方法、形成机制以及本质上完全不同于单层体积光栅的布拉格选择性的严格周期性角度响应，并对衍射效率的实际测量值与理论值之间的差异进行了简单讨论，指出了进一步提高其衍射效率的途径及叠层体积全息光栅潜在的应用前景。

By forming simultaneously photosensitive layers on both-sides of cellulosetriacetate film with chemical reaction, we obtained a holographic recording film withstratified sensitivity─dichromated cellulose triacetate(DC-TAC ). The stratifiedvolume holographic gratings(SVHG)recorded on the film have, to our best knowledge,the highest 1th-order experimental diffraction efficiency(54%).In this paper, themaking method and the micro-mechanism of forming SVHG are described.The strictlyperiodic selectivity of the SVHG is given. In addition, the difference of the diffraction efficiency of double-layer SVHG between the experimental value in DC-TAC and the theoretical prediction is discussed. The effective way for futher improving the diffraction efficiency and the potential applications of the SVHG in some interesting fields are suggested.