平面光栅衍射的简易分析方法

A Simple Method for Analyzing Plane-grating Diffraction

平面光栅衍射是物理学专业《光学》课程和非物理学的理工科专业《大学物理》课程中的重要内容。该文利用"等效光束"的方法分析平面光栅衍射现象。此方法不仅可以非常简单地导出光屏上光强分布规律,而且便于教师和学生深刻地理解Fraunhofer单缝衍射对多光束干涉的调制作用。

Plane-grating diffraction is an important part of the couses of Optics and College Physics, both of which are the re quired courses for the majors in physics and other science and engineering majors, respectively. This paper utilizes the idea of ＂equivalent beam＂ to analyze the phenomenon of plane-grating diffraction. Such a method can help us not only to simply obtain the distribution feature of the light intensity in a simple way, but also to better understand the modulation effect of the Fraun- hofer single-slot diffraction on the multi beam interference.