对实屏的夫琅禾费衍射中心亮点(亮纹)的半定性半定量论证

光经圆盘、细丝等实屏衍射后,衍射光场中其几何阴影中心有不为零的光强分布.显然这是阐述光的波动性的最好例证,它比圆孔、单缝之类的光孔衍射更具说服力.然而对圆盘等的衍射中心亮点(如泊松点)的论证通常都是从菲涅耳衍射出发,但是在绝大多数非物理类专业的大学物理中,对光的衍射的具体分析都只涉及夫琅禾费衍射,因而给学生对于上述问题...

The semi-qualitative and semi-quantitative demonstration for the centre light spot (or light fringe) of the Fraunhofer diffraction by a real obstacle screen

The intensity of diffracted light at the geometric centre of the diffraction optical field is always not zero through diffraction by a real obstacle screen such as a disk or a filament.Clearly,this is the best demonstration of the wave nature of light,and so it is more convincing than that of diffraction by an aperture such as a circular aperture or a slit.However.the theoretical analysis for the light spot(such as Poisson point) at the obstacle diffraction field center is usually based on the Fresnel diffr...