用方差定义的激光束横向尺寸的测量

MEASUREMENT OF LASER BEAM TRANSVERSE SIZE DEFINED BY SPATIAL VARIANCE

用方差定义的激光束横向尺寸，有着普适、简单和便于利用光学元件并行运算功能的特点．本文提出一种借助改变柱形容器内吸收液浓度来直接测量各种波长激光束横向尺寸的理论和方法．

The laser beam transverse size is defined by spatial variance of a beam intensity distribution,the definition method is universal,simple and easy to use optical element for carrying out complete integration. The theory and the method are described in the paper,it can directly measure the spatial variance along a given transverse direction of any laser beam of different wavelength, on the basis of change in the absorbing liquid concentration in a cylindrical vessel.