Numerical simulations of an Extreme AO system for an ELT


R. Clare, M. Le Louarn




We present the first full end to end numerical simulation results for a 200x200 sub-aperture modulated Pyramid WFS-based extreme AO, on a 42m telescope. The Pyramid wavefront sensor with modulation is used to reduce the effects of noise propagation (like aliasing and photon-noise). We present performance (Strehl and an estimate of contrast) as a function of system parameters like modulation, guide star magnitude and to explore the sensitivity of the system to for example loop gain and atmospheric turbulence profiles.

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