English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a method for the manufacturing of thin shells of glass, whichappears promising for the development of active optics for future spacetelescopes. The method exploits the synergy of different mature technologies,while leveraging the commercial availability of large, high-quality sheets ofglass, with thickness up to few millimeters. The first step of the methodforesees the pre-shaping of flat substrates of glass by replicating theaccurate shape of a mold via hot slumping technology. The replication conceptis advantageous for making large optics composed of many identical or similarsegments. After the hot slumping, the shape error residual on the opticalsurface is addressed by applying a deterministic sub-aperture technology ascomputer-controlled bonnet polishing and/or ion beam figuring. Here we focus onthe bonnet polishing case, during which the thin, deformable substrate of glassis temporary stiffened by a removable holder. In this paper, we report on theresults so far achieved on a 130 mm glass shell case study.

Thin glass shells for active optics for future space telescopes