【摘要】 本文以线性衍射理论为基础，通过数值分析得到高斯光束经圆波片衍射后在垂直平面上的光强分布．并由此进一步数值分析得到高斯光束衍射后的光束有效半径及其光束有效质量因子，说明高斯光束经圆波片衍射后，其有效质量因子大于１．更多还原

【Abstract】 In this paper, the numeral analysis for the diffraction distribution from a circular phase-plate with a Gaussian beam on the vertical plate of the axis is made. The diffraction beam′s effective radius and quality are obtained, the diffraction beam′s effective quality should be more than 1.更多还原