Laboratory demonstration of focal plane wavefront sensing using phase diversity: a way to tackle the problem of NCPA in SHARK-NIR. Part II: new characterization tests and alternative wavefront sensing strategies - ONERA - Office national d'études et de recherches aérospatiales Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Laboratory demonstration of focal plane wavefront sensing using phase diversity: a way to tackle the problem of NCPA in SHARK-NIR. Part II: new characterization tests and alternative wavefront sensing strategies

Résumé

Phase diversity is a focal-plane wavefront sensing technique. Two or more images of whatever object are required, differing in the amount of a well-calibrated injected aberration (typically a pure defocus). We present here new results concerning the laboratory demonstration of this concept in the specific context of SHARK-NIR, the new-generation high contrast imager for the Large Binocular Telescope. We tested the sensor both on a new dedicated testbed and on the instrument bench itself, which is now fully integrated. We characterized the behavior of the sensor in several conditions, in view of its application to sense SHARK-NIR non-common path aberrations at the telescope. We also investigated some alternative wavefront sensing strategies, such as a curvature-like sensor.
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hal-03938512 , version 1 (24-01-2023)

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Daniele Vassallo, Maria Bergomi, Elena Carolo, Davide Greggio, Luca Marafatto, et al.. Laboratory demonstration of focal plane wavefront sensing using phase diversity: a way to tackle the problem of NCPA in SHARK-NIR. Part II: new characterization tests and alternative wavefront sensing strategies. SPIE Astronomical Telescopes + Instrumentation, Jul 2022, Montréal, Canada. ⟨10.1117/12.2630292⟩. ⟨hal-03938512⟩
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