Readers last week were most interested in the mirror substrate SCHOTT has produced for the ESO’s ELT (SCHOTT Delivers World’s Largest Convex Mirror Substrate for the European Southern Observatory’s Extremely Large Telescope): “SCHOTT recently announced that it has manufactured a curved secondary mirror substrate made of ZERODUR® glass-ceramic in Mainz, Germany, for the European Southern Observatory’s (ESO) Extremely Large Telescope (ELT). The substrate is 10 cm thin, with an extreme curvature, a diameter of 4.25 m and a weight of 3 tons. The substrate was manufactured for the ELT’s secondary mirror (Mirror 2, or M2).
“After 16 months of production time, the substrate is journeying to France from the main plant in Mainz in a huge, extra-wide transport box. It will receive its ‘final touch’ there, comprising fine polishing at REOSC, a SAFRAN Group company. The actual mirror layer made of silver with a wafer-thin layer of silicon oxide as a protective film will be applied at the coating facility of the Paranal Observatory in Chile before it is mounted in the telescope.
“The requirements for the casting of the 4.25 m mirror substrate were extremely high due to very narrow specifications for the glass quality. Last year, a highly convex mirror substrate 10 cm thin was ground from the blank weighing more than 10 tons on state-of-the-art CNC machines.”
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Top 5 Hottest News Stories for January 20-26
- SCHOTT Delivers World’s Largest Convex Mirror Substrate for the European Southern Observatory’s Extremely Large Telescope
- Saint-Gobain Enters Discussions for Sale of its Silicon Carbide Division
#1 last week
- Automotive and Medical Segments Highlighted as Key Opportunities for Alumina through 2022
- FLSmidth Exits Bulk Material Handling Business
- Alteo Partners with Ginet to Focus on Battery Market in China 2nd week in Top 5
This weekly roundup highlights the ceramic, glass, refractories, brick and related news stories that garnered the most attention during the previous week on our website, as well as our eNewsletters and social media platforms.