Laboratory demonstration of focal plane wavefront sensing using phase diversity: a way to tackle the problem of NCPA in SHARK-NIR

Daniele Vassallo; Maria Bergomi; Federico Biondi; Elena Carolo; Davide Greggio; Luca Marafatto; Gabriele Umbriaco; Andrea Baruffolo; Marco De Pascale; Moritz Plenz; Kalyan Radhakrishnan; Valentina Viotto; Jean-Francois Sauvage; Thierry Fusco; Jacopo Farinato

doi:10.1117/12.2562510

13 December 2020 Laboratory demonstration of focal plane wavefront sensing using phase diversity: a way to tackle the problem of NCPA in SHARK-NIR

Daniele Vassallo, Maria Bergomi, Federico Biondi, Elena Carolo, Davide Greggio, Luca Marafatto, Gabriele Umbriaco, Andrea Baruffolo, Marco De Pascale, Moritz Plenz, Kalyan Radhakrishnan, Valentina Viotto, Jean-Francois Sauvage, Thierry Fusco, Jacopo Farinato

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 1144753 (2020) https://doi.org/10.1117/12.2562510
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Phase diversity is a wavefront sensing technique that makes use of images in the scientific channel to derive the instrumental aberrations. Two images of whatever object are required, with a well-calibrated differential aberration (typically a pure defocus) between the two. We present here 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 investigated the behavior of the sensor in presence of several aberrations of variable amplitude and we optimized the retrieval algorithm parameters by comparing the results with the ones of a Shack-Hartmann sensor. We illustrate the challenges and the perspectives of this technique in view of its application to sense non-common path aberrations in SHARK-NIR.

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Daniele Vassallo, Maria Bergomi, Federico Biondi, Elena Carolo, Davide Greggio, Luca Marafatto, Gabriele Umbriaco, Andrea Baruffolo, Marco De Pascale, Moritz Plenz, Kalyan Radhakrishnan, Valentina Viotto, Jean-Francois Sauvage, Thierry Fusco, and Jacopo Farinato "Laboratory demonstration of focal plane wavefront sensing using phase diversity: a way to tackle the problem of NCPA in SHARK-NIR", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144753 (13 December 2020); https://doi.org/10.1117/12.2562510

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