Experimental results of dOTF with the smiley pattern. From left to right: the phase map estimated using classical imaging (ϕ0 estimator), the phase map estimated using coronagraphic imaging with the classical phase ϕ0 estimator, the β estimator, and the α estimator (see A&A 2025 paper cited below).
Experimental results of dOTF in coronagraphic imaging mode using the β estimator when a single segment of the ASM is displaced up and down. From left to right: the phase map corresponding to a negative λ/10 poke, the phase map for a positive λ/10 poke, the phase map for a negative λ/20 poke, and the phase map for a positive λ/20 poke.
For more details, see our A&A 2025 paper: Revisiting the differential optical transfer function wavefront sensing technique for high-contrast imaging
