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Sagem-REOSC High Performance Optics Unit works on the polishing, coating and integration technologies of SiC mirrors since more than ten year through various successful space programs for various customers: INSAT 3D scan mirror, ROCSAT II and SPIRALE main telescopes, GAIA large primary mirrors and Auto-collimation flats, …).
This paper aims to provide to the international space community an exhaustive vision of the work performed by Sagem-REOSC on the polishing, coating and integration of the three Three Mirror Anastigmats of the NIRSpec spectrographic instrument which is the main ESA contribution to the JWST.
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Large mirrors with low stress and stable coatings.
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Large lens elements with strong curvature and precise layer specifications.
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Large filters with high spectral response uniformity specifications.
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IR coatings with low stress and excellent resistance to cryogenic environment for NIR to LWIR domains.
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Pixelated coatings.
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