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The numerical simulation of diffraction

WANG Xiao-feng,YU Guo-ping(School of Physics and Technology,Wuhan University,Wuhan,Hubei 430072,China)  
The method in angular spectrum theory to get the diffraction formula with solving the Helmholtz equation directly is introduced.The neai-field diffraction of a 15×15 array of square apertures is calculated,and the Talbot images of the periodic diffraction screen is arisen at specific distances.
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