Increasing the raw contrast of VLT/SPHERE with the dark hole technique - II. On-sky wavefront correction and coherent differential imaging

Open Access

Fig. 3

Radial performance of the PWP+EFC closed-loop algorithm in the top DH. Top: 1-σ standard deviation of the normalized high-pass-filtered images obtained at each iteration of the PWP+EFC on-sky closed loop in the top DH. Bottom: gain in performance with respect to the current SPHERE calibration (iteration 0).

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