Advancements in ion beam figuring of very thin glass plates (Conference Presentation)

M Civitani; M Ghigo; J Hołyszko; G Vecchi; S Basso; V Cotroneo; C. T DeRoo; E. D Schwartz; P. B Reid

doi:10.1117/12.2275555

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Conference proceeding

Advancements in ion beam figuring of very thin glass plates (Conference Presentation)

M Civitani, M Ghigo, J Hołyszko, G Vecchi, S Basso, V Cotroneo, C. T DeRoo, E. D Schwartz and P. B Reid

Proceedings of SPIE - The International Society for Optical Engineering, Vol.10399, pp.103991E-103991E-11

09/19/2017

DOI: 10.1117/12.2275555

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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.

Details

Title: Subtitle: Advancements in ion beam figuring of very thin glass plates (Conference Presentation)
Creators: M Civitani - INAF
M Ghigo - INAF
J Hołyszko - INAF - Osservatorio Astronomico di Brera (Italy)
G Vecchi - INAF
S Basso - INAF
V Cotroneo - Harvard University
C. T DeRoo - Harvard University
E. D Schwartz - Harvard University
P. B Reid - Harvard University
Contributors: Stephen L O'Dell (Editor) - NASA Marshall Space Flight Ctr. (United States)
Giovanni Pareschi (Editor) - INAF - Osservatorio Astronomico di Brera (Italy)
Resource Type: Conference proceeding
Publication Details: Proceedings of SPIE - The International Society for Optical Engineering, Vol.10399, pp.103991E-103991E-11
Publisher: SPIE
DOI: 10.1117/12.2275555
ISSN: 0277-786X
eISSN: 1996-756X
Language: English
Date published: 09/19/2017
Academic Unit: Physics and Astronomy; University College Courses
Record Identifier: 9984199709902771

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