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We present a method of Gaussian-beam-mode decomposition to calculateclassical diffraction of optical beams by apertures. This method offers aentirely different approach to examine the classic problem. Although our methodis based on a very straightforward setup, it is surprisingly effective. Wevalidate our method by comparing its results with those of Kirchhoff's fulldiffraction formula. Not only does our method have a simple and organizedanalytical framework, it also offers significant computational advantage.

An analytically simple and computationally efficient Gaussian beam mode-decomposition approach to classical diffraction theory