Confusion in differential piston measurement with the pyramid wavefront sensor

Open Access

Fig. 5.

Left: simulated residual wavefront error over the primary mirror. Right: PSF in presence of the island effect, obtained with a Fried parameter of r₀(500 nm)=12.8 cm and a pyramid in the visible wavelength. The island effect clearly appears and the SR is 28% at 1100 nm, compared with 50% without the island effect.

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