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提出一种测量激光高斯光束空间分布特征的新方法散斑位移法。该方法利用光传播的菲涅尔衍射公式和光场的统计规律 ,给出散斑场光强在散射体位移前后的高斯光束相关函数的表达式。测出相关函数在光路上某一位置的数值 ,并由此同时求出高斯光束的束腰位置和大小。
A new method of speckle displacement method is proposed to measure the spatial distribution of laser Gaussian beams. This method uses the Fresnel diffraction formula of light propagation and the statistical law of the light field to give the expression of Gaussian beam correlation function of speckle field intensity before and after displacement of the scatterer. The value of the correlation function at a certain position on the optical path is measured, and the position and size of the beam waist of the Gaussian beam are obtained simultaneously.