惠更斯-菲涅耳衍射积分 1. Applying the Huygens-Fresnel diffractive integral,the on-axis intensity distribution and the phenomena of focal shift and focal switch are theoretical studied when a partially coherent annular light is focused by a lens. 为了从理论上对部分相干环形光束被透镜聚焦后轴上点的光...