本文对马赫-曾德干涉实验进行拓展，实现了三光束、四光束干涉的实验尝试; 通过改变光束波矢夹角、光束强度、偏振态等参数，得到了一维周期性条纹、一维调制条纹、二维周期性光学格子、二维调制光学格子等干涉光场. 同时，通过提供光的干涉仿真模块，让学生自行对多光束干涉进行数值模拟，加深了对干涉理论的理解掌握. 通过上述“实虚结合”的光的干涉实验的内容拓展，不仅丰富了干涉实验教学内容，提高了学生的兴趣，而且有利于拓展学生的专业知识，从而了解相关领域的研究内容.

The experiment of Mach-Zehnder interference is expanded to realize the experiment of three-beam and four-beam interference. By changing the parameters of beam vector angles，beam intensity and polarization states，the interference light fields of one-dimensional periodic fringes，one-dimensional modulation fringes，two-dimensional periodic optical lattice and two-dimensional modulation optical lattice are obtained. By providing the interference simulation module of light，students can simulate the multi -beam interference by themselves，and this makes the students deeply understand the interference theory. Through the content expansion of the light interference experiment by combining the experiment and the virtual simulation，it not only enriches the teaching content of the interference experiment，improves the students interest，but also helps to expand the students professional knowledge and to understand the research content in related fields.