Production of thin glass mirrors by hot slumping for x-ray telescopes: present process and ongoing development

B. Salmaso; S. Basso; C. Brizzolari; M. Civitani; M. Ghigo; G. Pareschi; D. Spiga; G. Tagliaferri; G. Vecchi

doi:10.1117/12.2056038

28 July 2014 Production of thin glass mirrors by hot slumping for x-ray telescopes: present process and ongoing development

B. Salmaso, S. Basso, C. Brizzolari, M. Civitani, M. Ghigo, G. Pareschi, D. Spiga, G. Tagliaferri, G. Vecchi

Author Affiliations +

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 91512W (2014) https://doi.org/10.1117/12.2056038
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

Citation Download Citation

B. Salmaso, S. Basso, C. Brizzolari, M. Civitani, M. Ghigo, G. Pareschi, D. Spiga, G. Tagliaferri, and G. Vecchi "Production of thin glass mirrors by hot slumping for x-ray telescopes: present process and ongoing development", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91512W (28 July 2014); https://doi.org/10.1117/12.2056038

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available