基于DMD的光学衍射实验教学  

DMD-based experimental teaching for optical diffraction

作　　者：王自强 龚雷 WANG Ziqiang;GONG Lei(Department of Optics and Optical Engineering,School of Physical Sciennces,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学物理学院光学与光学工程系,安徽合肥230026

出　　处：《物理实验》2023年第1期28-31,共4页Physics Experimentation

基　　金：安徽省教学研究项目(No.2019xjyxm075);国家自然科学基金项目(No.11974333);中国科学技术大学本科质量工程项目(No.2020xjyxm063,No.2021xjyxm044)。

摘　　要：研究各种形状衍射屏的衍射特性,有利于加强学生对光学衍射基本理论的理解.为此,开发了基于数字微镜阵列器件(Digital micromirror device,DMD)空间光调制器的新型光学衍射实验系统.采用DMD替代传统的加工衍射元件,用Paint,AutoCAD和Matlab等绘图软件生成单缝、多缝以及复杂形状的图形,并加载到DMD,以作为可擦写的数字化衍射屏.当准直激光均匀照射数字衍射屏并通过透镜,CMOS相机可在透镜后焦面实时观察各衍射屏的远场衍射图像,进而对夫琅禾费衍射特性进行观测和分析.该新型实验系统能够完成单缝、多缝衍射实验,并拓展至任意形状衍射屏的衍射实验.The study of diffraction characteristics of various screens is helpful to strengthen students’understanding of the optical diffraction theory.In this paper,a novel experimental system based on a digital micromirror device(DMD)for the diffraction experiments was developed,in which DMD was used to replace the traditional fabricated masks.With such a device,single-slit,multi-slit and diffraction screens with complex shapes were drawn with Paint,AutoCAD or Matlab,and then loaded onto DMD,so as to be a reconfigurable digital diffraction screen.When the diffraction screen was uniformly illuminated by a collimated laser beam,the far-field diffraction patterns yielded at the back focal plane of a lens,which could also be observed by a CMOS camera.Finally,the images were used to analyze the Fraunhofer diffraction properties.The novel experimental system could not only perform typical single-slit and multi-slit diffraction experiments but also diffraction experiments with screens of arbitrary shapes.

关 键 词：数字微镜器件 衍射实验 衍射屏 CMOS相机 

分 类 号：O436.1[机械工程—光学工程]