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Aims. We present a solution to improve the performance of coronagraphs forthe detection of exo-planets. Methods. We simulate numerically several kinds ofcoronagraphic systems, with the aim of evaluating the gain obtained with anadaptive hologram. Results. The detection limit in flux ratio between a starand a planet (Fs/Fp) observed with an apodized Lyot coronagraph characterizedby wavefront bumpiness imperfections of lambda/20 (resp. lambda/100) turns outto be increased by a factor of 10^3.4 (resp. 10^5.1) when equipped with ahologram. Conclusions. This technique could provide direct imaging of anexo-Earth at a distance of 11 parsec with a 6.5m space telescope such as theJWST with the optical quality of the HST.

Extreme coronagraphy with an adaptive hologram Simulations of exo-planet imaging