I build a simple model with a Source Ellipse, two paraxial lens with the same f and spaced 2*f apart. So in theory from Source Ellipse are first focused by the first lens and then we can get a plane wave after the second lens. If we put a detector after the second lens, all rays hitting the detector should have the same coherent phase, but that's not the case.
Solved
Why paraxial lens cannot simulate optical path difference and resulting phase difference accurately?
details are shown as following
Because I need to analyze the wavefont of a flys eye array, I plan to combine many paraxial lenses as an array. However this problem shocked me😥
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