为了研究正交余弦光栅的衍射场, 采用波前相因子判断法并考虑到光栅孔径的影响, 对正交余弦光栅的衍射进行了理论分析, 得到了正交余弦光栅衍射场所含基元成分, 导出了像面波前函数、像面振幅分布函数和光强分布函数, 并得出主焦斑的半角宽度。结果表明, 该研究可为光栅用于光学信息处理技术提供理论依据。

In order to analyze diffraction field of orthogonal cosine-gratings, it was analyzed based on the method of wave-front phase factors and considering the influence of limited aperture of grating. The phase-front function, amplitude and intensity expressions of the diffraction field were deduced. The amplitude and intensity of light distribution diagram of phase plane were obtained. Finally, the half-angle-width of maximum value in the center was given. This study may further provide a theoretical foundation to analyze diffraction of orthogonal cosine-gratings.