中文说明：此程序用于模拟，菲涅尔衍射光束和夫朗和费衍射光束的对比。
English Description：
This program is used to simulate the comparison of Fresnel diffracted beams and Fraunhofer diffracted beams.
Diffraction of light beam and Longfellow beam
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中文说明：此程序用于模拟，菲涅尔衍射光束和夫朗和费衍射光束的对比。
English Description：
This program is used to simulate the comparison of Fresnel diffracted beams and Fraunhofer diffracted beams.