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Proceedings Paper

Production of thin glass mirrors by hot slumping for x-ray telescopes: present process and ongoing development
Author(s): B. Salmaso; S. Basso; C. Brizzolari; M. Civitani; M. Ghigo; G. Pareschi; D. Spiga; G. Tagliaferri; G. Vecchi
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Paper Abstract

Thin glass foils are considered good candidates to build a segmented X-ray telescope with effective area as large as 2 m2 and angular resolution better than 5 arcsec. In order to produce thin glass mirror segments, we developed a direct hot slumping technique assisted by pressure, in which the shape of a mould is replicated onto the optical surface of the glass. In this paper we present the result obtained with AF32 (by Schott) and EAGLE XG (by Corning) glass types. The selected mould material is Zerodur K20, as it does not require any anti-sticking layer and has a good matching, in terms of Coefficient of Thermal Expansion, with both glass types. Our group already produced a few prototypes, reaching angular resolution near 20 arcsec. In this work, relevant steps forward aimed at attaining a 5 arcsec angular resolution are described, along with the tuning of few key parameters in the slumping process. The results obtained on a newly procured cylindrical Zerodur K20 mould are presented.

Paper Details

Date Published: 28 July 2014
PDF: 14 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91512W (28 July 2014); doi: 10.1117/12.2056038
Show Author Affiliations
B. Salmaso, INAF - Osservatorio Astronomico di Brera (Italy)
Univ. degli Studi dell'Insubria (Italy)
S. Basso, INAF - Osservatorio Astronomico di Brera (Italy)
C. Brizzolari, INAF - Osservatorio Astronomico di Brera (Italy)
Univ. degli Studi di Milano Bicocca (Italy)
M. Civitani, INAF - Osservatorio Astronomico di Brera (Italy)
M. Ghigo, INAF - Osservatorio Astronomico di Brera (Italy)
G. Pareschi, INAF - Osservatorio Astronomico di Brera (Italy)
D. Spiga, INAF - Osservatorio Astronomico di Brera (Italy)
G. Tagliaferri, INAF - Osservatorio Astronomico di Brera (Italy)
G. Vecchi, INAF - Osservatorio Astronomico di Brera (Italy)


Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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