【摘要】 把圆孔光阑窗口函数展开为有限复高斯函数和,用Collins积分公式导出了高斯光束圆孔衍射光场分布的近似解析表达式。经计算机数值计算,分析了轴上光强和不同衍射区观察面上的光强分布,研究了轴上任意点的光强随圆孔半径变化的关系。指出轴上存在"衍射焦点"。更多还原

【Abstract】 Based on Collins integral formula and the expansion of the hard aperture function into a finite sum of complex Gaussian functions,the approximate analytical expression of the diffraction field of Gaussian beam by a circular aperture is derived,the intensity distribution on the axis and the different diffractive regions are analyzed by the numerical calculation and numerical simulation.The relation between the intensity on the axis and the radius of the aperture is studied.There is diffractive focus on axis.更多还原