How to use the coronagraph module
Coronagraph Overview The coronagraph module simulates electric field propagation through a coronagraph located downstream the AO loop. The input is the target residual phase, and the main output is the coronagraph image. Two types of coronagraphs are implemented : a perfect coronagraph and a more realistic coronagraph called four-plane coronagraph hereafter.
Perfect coronagraph The perfect coronagraph substracts the diffractive effect of the telescope. Mathematically speaking, the following operations are performed:
Electric field is computed from the incoming phase screen The average of the electric field over the pupil is substracted to the electric field Optical Fourier transform and square modulus yield the image in focal plane References : Galicher, Raphaël : PhD thesis, section I.2.2.4 Sauvage, Jean-François : PhD thesis, section 2.4.3.1
Four-plane coronagraph The four-plane coronagraph includes the different pupil and focal planes of a stellar coronagraph, in this order following the light in the instrument:
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