A strategy for sensing the petal mode in the presence of AO residual turbulence with the pyramid wavefront sensor

Open Access

Fig. 1

Petal mode with variable r₀ and spider size. Left: Petal variation for large spiders and variable r₀ in first-stage residuals. For spiders larger than the pitch of the ELT DM, the petal mode increases quickly. Right: Petal variation for large spiders and variable r₀ in first-stage residuals corrected of the atmospheric turbulence amplitude.

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