Principle of the self-coherent camera (SCC). The stellar beam (red) hits a deformable mirror, and goes through a focal plane coronagraphic mask and a Lyot stop. Because of wavefront aberrations, part of the starlight goes through the image channel inducing speckles on the detector. Selecting part of the starlight rejected by the focal mask (reference channel), one spatially modulates the speckle intensity in the SCC image (top right). It is then possible to measure the speckle electric field from the Fourier transform of the SCC image (bottom right) in order to control the deformable mirror. The planet light (blue) is not affected by the coronagraph and the planet image is not fringed.
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