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Geometrical-numerical approach to diffraction phenomena

机译:衍射现象的几何数字方法

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The calculation of diffracted fields is considered by means of a geometrical analysis of the incoming wave into semiperiodic zones in the aperture plane, followed by a numerical process for addition of the contributions corresponding to the semiperiodic zones. This general approach constitutes a novel interpretation of diffraction phenomena that permits exact evaluation of the mathematical expressions of diffraction theory and overcomes the limitations of any approximation. The method is illustrated by analysis of two important configuration in optics: the pinhole camera, for which we deduce the optimum radius for imaging, and the diffraction of a spherical converging wave through a circular aperture, from which we determine the limit of the validity of the Fraunhofer approximation (i.e., of the Airy pattern) and the influence of the obliquity factor. (C) 2001 Optical Society of America OCIS codes: 050.1460, 050.1220. [References: 12]
机译:衍射场的计算是通过对进入孔径平面中半周期区域的入射波进行几何分析来考虑的,然后进行数值处理以添加与半周期区域相对应的贡献。这种通用方法构成了对衍射现象的新颖解释,可以对衍射理论的数学表达式进行精确评估,并克服了任何近似方法的局限性。通过分析光学中的两个重要配置来说明该方法:针孔相机,我们推导出其最佳成像半径;球面会聚波通过圆形孔径的衍射,从中我们确定了该方法的有效性极限。弗劳恩霍夫(Fraunhofer)近似(即,艾里模式)和倾角因子的影响。 (C)2001年美国光学学会OCIS编码:050.1460、050.1220。 [参考:12]

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