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Proceedings Paper

Fused silica long-term stability: case studies
Author(s): Maurizio Vannoni; Andrea Sordini; Giuseppe Molesini
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Paper Abstract

The time stability of fused silica is investigated, reporting new data on two flats that were purchased in 1981. It is found that their present shape is no more plane, exhibiting instead a concavity that is compatible with a very slow laminar flow under the action of gravity. The data are examined altogether with those of prior observations, confirming the occurrence of a relaxation process whose time constant is estimated in the order of 10 years; during such a time period, viscosity approximately increases by a factor of three. Starting from the experimental data so far collected, the computations accounting for the estimates above are given in detail.

Paper Details

Date Published: 21 September 2011
PDF: 6 pages
Proc. SPIE 8169, Optical Fabrication, Testing, and Metrology IV, 816906 (21 September 2011); doi: 10.1117/12.896758
Show Author Affiliations
Maurizio Vannoni, Istituto Nazionale di Ottica, CNR (Italy)
Andrea Sordini, Istituto Nazionale di Ottica, CNR (Italy)
Giuseppe Molesini, Istituto Nazionale di Ottica, CNR (Italy)

Published in SPIE Proceedings Vol. 8169:
Optical Fabrication, Testing, and Metrology IV
Angela Duparré; Roland Geyl, Editor(s)

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