Open AccessAdaptive optics for high‐contrast imaging: pyramid sensor versus spatially filtered Shack–Hartmann sensor
Author(s) -
Vérinaud C.,
Le Louarn M.,
Korkiakoski V.,
Carbillet M.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society: letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.067
H-Index - 122
eISSN - 1745-3933
pISSN - 1745-3925
DOI - 10.1111/j.1745-3933.2005.08638.x
Subject(s) - adaptive optics , physics , telescope , pyramid (geometry) , optics , aliasing , noise (video) , wavefront sensor , sensitivity (control systems) , computer science , artificial intelligence , computer vision , filter (signal processing) , image (mathematics) , electronic engineering , engineering
A comparison between pyramid‐based and spatially filtered Shack–Hartmann‐based high‐order adaptive optics (AO) is presented in the framework of 8‐m‐class and extremely large telescopes (ELTs). We first show, with end‐to‐end simulations of an 8‐m AO assisted telescope, how each sensor deals with the aliasing error, which may be the dominant error source at high flux. Then, focusing on photon noise error propagation, we study the field dependence of the sensitivity gain provided by the pyramid sensor with respect to the Shack–Hartmann sensor. From this analysis, we investigate, with an analytical model, visible correction on ELTs for detection of Earth‐like exoplanets.