Optimization of Apodized Pupil Lyot Coronagraph for Planet Finder Instruments

Physics

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Scientific paper

In the context of exoplanet imaging with ground based telescopes, we studied the optimization of the Apodized Pupil Lyot Coronagraph (APLC). APLC is an improvement of the Lyot coronagraph design combining a radially variable transmission in the pupil plane with a small Lyot mask in the focal plane of the instrument. The interest of this coronagraph has already been demonstrated for monolithic 2-8 meters telescopes and some prototypes are being manufactured for several projects. Our analysis is focused on the optimization of APLC for Extremely Large Telescopes (30-60 meters) but is still applicable to any telescope diameter and configuration. Here, we define a tool to optimize APLC parameters with respect to telescope designs in order to derive the optimal mask size for high contrast imaging. We analyze the behavior of the optimal mask size in function of ELTs characteristics (central obscuration, spiders, low-order segment aberrations and reflectivity) and chromatism. This optimization is then applied to specific ELT designs.

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