激光散斑在大学物理实验教学中的应用

SEVERAL LASER SPECKLE EXPERIMENTS WORTHY OF BEING INTRODUCED TO COLLEGE PHYSICS EXPERIMENT TEACHING

介绍了激光散斑在大学物理实验中的几个具体应用.从激光散斑的特征公式出发,分析了利用激光散斑测量透镜焦距的原理和方法;介绍了应用双曝光散斑图测量物体面内位移的原理和方法;利用激光散斑的统计特性,提出了一种测量高斯光束特性参数的新方法.这些方法光路设计简便易行,且具有实用价值,引入到大学物理实验中是可取的,也是可行的.

Some applications of laser speckle to college physics experiment were put forward.Based on the expression for size of laser speckle,the principle and method of measuring focal length of a lens were analyzed;the principle and method of measuring the in-plane displacement of a object were introduced;by means of the statistical properties of laser speckle,a new method of measuring characteristic parameters of Gaussian beam was proposed.The methods mentioned above are simple,convenient and easy,and have practical value.It is advisable and feasible to introduce these laser speckle experiments to college physics experiment teaching.