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Proceedings Paper

Advancements in ion beam figuring of very thin glass plates (Conference Presentation)
Author(s): M. Civitani; M. Ghigo; J. Hołyszko; G. Vecchi; S. Basso; V. Cotroneo; C. T. DeRoo; E. D. Schwartz; P. B. Reid
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Paper Abstract

The high-quality surface characteristics, both in terms of figure error and of micro-roughness, required on the mirrors of a high angular resolution x-ray telescope are challenging, but in principle well suited with a deterministic and non-contact process like the ion beam figuring. This process has been recently proven to be compatible even with very thin (thickness around 0.4mm) sheet of glasses (like D263 and Eagle). In the last decade, these types of glass have been investigated as substrates for hot slumping, with residual figure errors of hundreds of nanometres. In this view, the mirrors segments fabrication could be envisaged as a simple two phases process: a first replica step based on hot slumping (direct/indirect) followed by an ion beam figuring which can be considered as a post-fabrication correction method. The first ion beam figuring trials, realized on flat samples, showed that the micro-roughness is not damaged but a deeper analysis is necessary to characterize and eventually control/compensate the glass shape variations. In this paper, we present the advancements in the process definition, both on flat and slumped glass samples.

Paper Details

Date Published: 21 September 2017
PDF: 11 pages
Proc. SPIE 10399, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII, 103991E (21 September 2017); doi: 10.1117/12.2275555
Show Author Affiliations
M. Civitani, INAF - Osservatorio Astronomico di Brera (Italy)
M. Ghigo, INAF - Osservatorio Astronomico di Brera (Italy)
J. Hołyszko, INAF - Osservatorio Astronomico di Brera (Italy)
G. Vecchi, INAF - Osservatorio Astronomico di Brera (Italy)
S. Basso, INAF - Osservatorio Astronomico di Brera (Italy)
V. Cotroneo, Harvard-Smithsonian Ctr. for Astrophysics (United States)
C. T. DeRoo, Harvard-Smithsonian Ctr. for Astrophysics (United States)
E. D. Schwartz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
P. B. Reid, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 10399:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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