23 July 2008 Polishing, coating, and integration of SiC mirrors for space telescopes
Author Affiliations +
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jacques Rodolfo, 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); doi: 10.1117/12.790620; https://doi.org/10.1117/12.790620
PROCEEDINGS
8 PAGES


SHARE
RELATED CONTENT

A new technological step for sic mirrors preparing OTOS
Proceedings of SPIE (November 17 2017)
NIRSpec optics development: final report
Proceedings of SPIE (November 20 2017)
NIRSpec optics development: the final report
Proceedings of SPIE (September 14 2011)
Developing SiC for optical system applications
Proceedings of SPIE (October 22 2004)

Back to Top