非对称方孔的夫琅和费和菲涅耳衍射

Fraunhofer and Fresnel diffraction at two asymmetrical rectangular apertures

基于标量衍射理论 ,对均匀平面波通过两个非对称双矩孔的衍射作了解析研究和数值计算 ,给出了夫琅和费和菲涅耳衍射的横向、轴上和轴外光强分布。研究表明 ,可用其最大光强的相对误差来区别夫琅和费和菲涅耳衍射 ,所得结果与两个圆孔情况一致。

Based on the theory of scalar diffraction,the diffraction of a uniform plane wave at two asymmetrical rectangular apertures is studied analytically and numerically. The transversal,on-axis and off-axis intensity distributions of the Fraunhofer and Fresnel diffraction are given and analyzed. It is shown that the Fraunhofer and Fresnel diffraction can be distinguished by the relative error of their maximum intensity. The result is consistent with that for the case of two circular apertures.