光栅衍射缝间干涉因子次极大强度对称性的菲涅耳半波带法证明

本文用菲涅耳半波带法推导出了一个非常有用的次极大位置公式，将该位置公式和振幅矢量法求出的次极大位置结合起来，方便地求出了缝间干涉因子的次极大的强度，证明了缝向干涉因子的次极大强度具有对称性。避免了对振幅矢量法求次极大位置这个方程的直接求解，因为用该方法求出的次极大强度与理论值完全符合，说明菲涅耳半波带法不但可以用来分析单缝衍射，同时还完全能够用来分析光栅衍射。

Testifying secondary maximum among slits interference item of grating diffraction is symmetrical with Fresnel Zone Plate Method

We devise a useful formula of secondary maximum location with Fresnel Zone Plate Method. We combine this Location and that location from amplitude vector method. We find it easily and testify secondary maximum of interference factor is symmetrical. We use this method avoiding find directly the solution of complex equation of secondary maximum location with amplitude vector method. Because calculating result is as symmetrical as theory value. It show that we can analyse not only single-slit diffraction but also grating diffraction with Fresenl Zone Plate Method.