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Proceedings Paper

Investigation of a novel slumping technique for the manufacturing of stiff and lightweight optical mirrors
Author(s): R. Canestrari; M. Ghigo; G. Pareschi; S. Basso; L. Proserpio
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Paper Abstract

The Astronomical Observatory of Brera (INAF-OAB) is investigating a novel slumping technique for the manufacturing of stiff and lightweight optical segments. We propose a 2-steps technique: initially the procedure foresees to manufacture a mirror segment using the hot slumping technique. This step produces a thin and floppy Borofloat glass shell using the slumping of a glass sheet onto a ceramic mould that has a surface with a high optical quality. After this step, this curved shell is assembled and glued to a stiff substrate made in foamed and pre-shaped material. On the back of the substrate it is also glued a flat sheet of the same glass. This procedure combine the good optical performances achievable on optics produced by means of the hot slumping technique with the lightweight and stiffness of the foamed material and, finally, the good structural properties achievable in sandwich-like structures. This approach could be in principle used for the production of mirrors for a number of applications, from the primary segmented mirror for large telescopes to the mirrors for the future Cherenkov telescopes nowadays under development. This paper describes the process of production of a prototype optical segment and the status of the investigation.

Paper Details

Date Published: 25 July 2008
PDF: 10 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70180D (25 July 2008); doi: 10.1117/12.790405
Show Author Affiliations
R. Canestrari, INAF-Osservatorio Astronomico di Brera (Italy)
Univ. degli Studi dell'Insubria (Italy)
M. Ghigo, INAF-Osservatorio Astronomico di Brera (Italy)
G. Pareschi, INAF-Osservatorio Astronomico di Brera (Italy)
S. Basso, INAF-Osservatorio Astronomico di Brera (Italy)
L. Proserpio, INAF-Osservatorio Astronomico di Brera (Italy)
Univ. degli Studi dell'Insubria (Italy)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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