分析五方孔的衍射场

Analysis of diffraction fields of five square hole

采用波前相因子判断法研究五方孔的衍射场,得出五方孔衍射场所含基元成份。根据惠更斯-菲涅耳原理,导出像面上的振幅分布公式及像面上的光强分布公式等。并利用数值模拟的方法得出五方孔的衍射图样。结果表明,在验证衍射理论的同时,还拓展了衍射的概念,为深入理解光的衍射提供理论基础。

In order to analyze diffraction fields of Five square hole,Based on the method of wave-front phase-factors and considering of the influence of limited aperture of grating, we have analysis out the diffraction fields by Five square hole which contain components, and offered corresponding integral expressions of the diffraction fields. It derivate formulae of the amplitude distribution of diffraction fields .Finally the amplitude and the length strength parameter distribution along axis are obtained. Finally the transverse line-width and axial line-width of that real focal-spot are obtained. This study may further provide a theoretical foundation to Optical element by combination cosine-grating.