13 September 2012 Influence of atmospheric turbulence on the Zernike phase contrast method and the first steps towards the phasing of segmented deformable mirrors
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Abstract
The Zernike phase contrast sensor has been studied in the framework of the Active Phasing Experiment in the laboratory and on sky at the Very Large Telescope. Atmospheric turbulence strongly affects the shape of the signal of the Zernike phase contrast sensor. The first part of these proceedings is dedicated to a study of the influence of atmospheric turbulence on the signal of the Zernike phase contrast sensor. The second part is dedicated to the phasing of segmented deformable mirrors. A new technology of segmented deformable mirrors for adaptive optics made from silicon wafers with bimorph piezoelectric actuation has been proven to work. A demonstrator with three hexagonal segments of 90 mm corner to corner has been built. The morphing capability of the segmented mirror has been studied and validated by simulations and on a test bench. In this paper, we demonstrate with simulations the phasing of the segmented bimorph mirror with the Zernike phase contrast method. Aspects such as phasing in the presence of segment aberrations have been investigated.
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I. Surdej, I. Surdej, E. Romnée, E. Romnée, R. Bastaits, R. Bastaits, A. Preumont, A. Preumont, N. Yaitskova, N. Yaitskova, L. Noethe, L. Noethe, } "Influence of atmospheric turbulence on the Zernike phase contrast method and the first steps towards the phasing of segmented deformable mirrors", Proc. SPIE 8447, Adaptive Optics Systems III, 84476L (13 September 2012); doi: 10.1117/12.926473; https://doi.org/10.1117/12.926473
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