A deformable mirror on the THD2 bench creates a polarization-dependent beam shift of several hundred nanometers, about ten times larger than predicted, degrading coronagraph contrast.
Increasing the raw contrast of VLT/SPHERE with the dark hole technique. II. On-sky wavefront correction and coherent differential imaging,
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Polarization effects on high contrast imaging: measurements on THD2 Bench
A deformable mirror on the THD2 bench creates a polarization-dependent beam shift of several hundred nanometers, about ten times larger than predicted, degrading coronagraph contrast.