When a volume holographic grating is readout under off-Bragg condition, determining the direction of the diffracted beam is an important issue in the coupled-wave theory of volume gratings.
体全息光栅的读出偏离布拉格条件时，衍射光方向的确定是体光栅耦合波理论中的一个重要问题。
According to the refractive index ellipsoid of uniaxial crystal, the relationship between diffraction efficiency of volume grating and polarization state of readout beam is theoretically analyzed.
根据单轴晶体的折射率椭球，从理论上分析了光折变体光栅的衍射效率与读出光偏振态的关系。
Furthermore, the paper offers the error limited of these parameters and they are good to guide practical fabrication of the volume phase holographic grating.
同时，本文还计算出了这几种参数的误差容限，这对体积相位全息光栅的实际制作具有指导作用。
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