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- W2078196618 abstract "The first monolithic ZERODUR® 4 m class mirror was ordered by the German Max Planck Institute for AstronomicalPhysics in 1968. A ratio of 1:6 for thickness to diameter ratio ensured the necessary stiffness to minimize deformationunder gravity load. The technological ability to actively compensate the bending of the mirror substrate under gravityinitiated the development from heavy non active thick mirror substrates to ever thinner thicknesses starting with theNTT, the New Technology Telescope of ESO.The thinner the mirror substrates are becoming the more demanding are the requests on homogeneity of materialproperties to ensure best performance over the clear aperture at every spot.In this paper we present results on material properties achieved for the 4 m class mirror substrates recently delivered bySCHOTT. The CTE homogeneity, the internal quality regarding striae, bubbles and inclusions as well as stressbirefringence data are reported. Improvements in CNC processing and overall manufacturing process for the very thin 4m class blanks are discussed." @default.
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- W2078196618 date "2011-09-08" @default.
- W2078196618 modified "2023-09-26" @default.
- W2078196618 title "Progress in 4m class ZERODUR mirror production" @default.
- W2078196618 doi "https://doi.org/10.1117/12.894419" @default.
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