Polishing, coating, and integration of SiC mirrors for space telescopes

Jacques Rodolfo

doi:10.1117/12.790620

23 July 2008 Polishing, coating, and integration of SiC mirrors for space telescopes

Jacques Rodolfo

Proceedings Volume 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation; 70180E (2008) https://doi.org/10.1117/12.790620
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

In the last years, the technology of SiC mirrors took an increasingly significant part in the field of space telescopes. Sagem is involved in the JWST program to manufacture and test the optical components of the NIRSpec instrument. The instrument is made of 3 TMAs and 4 plane mirrors made of SiC. Sagem is in charge of the CVD cladding, the polishing, the coating of the mirrors and the integration and testing of the TMAs. The qualification of the process has been performed through the manufacturing and testing of the qualification model of the FOR TMA. This TMA has shown very good performances both at ambient and during the cryo test. The polishing process has been improved for the manufacturing of the flight model. This improvement has been driven by the BRDF performance of the mirror. This parameter has been deeply analysed and a model has been built to predict the performance of the mirrors. The existing Dittman model have been analysed and found to be optimistic.

Citation Download Citation

Jacques Rodolfo "Polishing, coating, and integration of SiC mirrors for space telescopes", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70180E (23 July 2008); https://doi.org/10.1117/12.790620

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