Manufacturing of glassy thin shell for adaptive optics: results achieved

F. Poutriquet; A. Rinchet; J.-L. Carel; H. Leplan; E. Ruch; R. Geyl; G. Marque

doi:10.1117/12.925344

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13 September 2012 Manufacturing of glassy thin shell for adaptive optics: results achieved

F. Poutriquet, A. Rinchet, J.-L. Carel, H. Leplan, E. Ruch, R. Geyl, G. Marque

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Proceedings Volume 8447, Adaptive Optics Systems III; 84472H (2012) https://doi.org/10.1117/12.925344
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Glassy thin shells are key components for the development of adaptive optics and are part of future and innovative projects such as ELT. However, manufacturing thin shells is a real challenge. Even though optical requirements for the front face - or optical face - are relaxed compared to conventional passive mirrors, requirements concerning thickness uniformity are difficult to achieve. In addition, process has to be completely re-defined as thin mirror generates new manufacturing issues. In particular, scratches and digs requirement is more difficult as this could weaken the shell, handling is also an important issue due to the fragility of the mirror. Sagem, through REOSC program, has recently manufactured different types of thin shells in the frame of European projects - E-ELT M4 prototypes and VLT Deformable Secondary Mirror (VLT DSM).

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F. Poutriquet, A. Rinchet, J.-L. Carel, H. Leplan, E. Ruch, R. Geyl, and G. Marque "Manufacturing of glassy thin shell for adaptive optics: results achieved", Proc. SPIE 8447, Adaptive Optics Systems III, 84472H (13 September 2012); https://doi.org/10.1117/12.925344

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