Stiff and Lightweight Optical Mirrors Made by Glass Slumping with Foamed Core

Details Stiff and Lightweight Optical Mirrors Made by Glass Slumping with Foamed Core Stiff and Lightweight Optical Mirrors Made by Glass Slumping with Foamed Core

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460003p&link_type=abstract

American Astronomical Society, AAS Meeting #214, #600.03

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At the Brera Astronomical Observatory (Milan-Italy) an innovative technique is under development aiming at permitting the manufacturing of high quality astronomical mirrors, with a drastic reduction of the mirror weight, cost, and production time. The method foresees two main steps: a) a thin mirror shell is produced using a hot slumping technique. A flat glass sheet having a thickness of few mm is placed onto a convex ceramic mould having a high optical quality. During a suitable thermal cycle the glass sheet will slump onto the mould and the glass will copy with high accuracy the shape of the mould. This step produces a thin and floppy concave glass shell having a good intrinsic optical shape. b) the curved shell (maintained in its intrinsic shape) is assembled and glued to a stiff substrate made in a foamed and pre-shaped material. To obtain a sandwich structure, on the back of the substrate it is also glued a flat sheet of the same glass. Due to this replica approach, the system could be in principle used for the mass production of identical mirrors for a number of applications, as e.g. faced large primary mirrors. This paper describes the process of production of a prototype optical segment and the status of the investigation.

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