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本文采用耦合波方法计算了对称面形光栅的衍射效率，分析了光栅截面面形为正弦、三角形、矩形、梯形光栅衍射效率与光栅周期、沟槽深度的关系，计算了光栅的峰值衍射效率．理论计算表明：合理地选择光栅周期、沟槽深度，对称面形光栅都可以达到很高衍射效率，接近１００％；光栅的峰值衍射效率基本出现在Ｂｒａｇｇ衍射且光栅的周期等于衍射波长时
In this paper, the diffraction efficiency of the symmetric grating is calculated by the coupled wave method. The relationship between the diffraction efficiency of the grating and the grating period and groove depth is analyzed. The peak diffraction efficiency of the grating is calculated. The theoretical calculation shows that the diffraction efficiency of the grating can be very high, which is close to 100% for the grating period and the groove depth. The diffraction efficiency of the grating is basically in Bragg diffraction and the grating period is equal to the diffraction wavelength