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19 July 2010 On the super polishing under stress of aspherical surfaces for exoplanet detection and solar instruments
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Abstract
The stress polishing method is well suited for the superpolishing of aspheric components for astronomy. The main advantage of this technique is the very high optical quality obtained either on form or on high spatial frequency errors. Furthermore, the roughness can be decreased down to a few angstrom, thanks the classical polishing with a large pitch tool. We describe here the results obtained on the three toric mirrors for the ESO/VLT-SPHERE instrument, dedicated to exoplanet direct imaging. On going work on variable off axis aspherics is presented in the frame of the ESA/ASPIICS-Proba3 mission for solar coronography and applications for Exoplanet detection and solar observations are discussed.
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Emmanuel Hugot, Marc Ferrari, Sébastien Vives, Marie Laslandes, Kacem El Hadi, Sébastien Moindrot, Gérard R. Lemaitre, and Kjetil Dohlen "On the super polishing under stress of aspherical surfaces for exoplanet detection and solar instruments", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77390F (19 July 2010); https://doi.org/10.1117/12.855986
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