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Fig. L.1
Spider Fresnel diffraction calculation for a VLT coronagraphic pupil (ϵ = 0.14) and the diameter of the coronagraphic pupil of 18 mm. The figure shows a comparison between the classical Fresnel diffraction (lp = 0) and the optical propagation including the vortex (lp = 2). The thickness of the spider is 225 μm.
This figure is made of several images, please see below:
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