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Proceedings Paper

Thermal Distortion Of A Thin Low Expansion Fused Silica Mirror
Author(s): John W. Pepi; William P Barnes Jr.
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Paper Abstract

To meet the demands of a fraction of a wavelength of light residual error imposed by high resolution optical systems, detailed analytical modeling techniques are required. For large lightweight, optical elements, errors can be significant even in a relatively benign thermal environment with materials exhibiting near zero coefficient of thermal expansion (CTE). This study evaluates a thin, circular, spherical mirror made of Corning Glass Works Ultra Low Expansion (ULE) fused silica glass, subjected to thermal loading. To validate performance characteristics, a detailed finite element mathematical model is made, utilizing the NASTRAN digital routine. Included are typical Corning measured values of CTE, which vary positively and negatively within the mirror about a near zero nominal value. NASTRAN results under thermal soak and linear gradient conditions are com-pared to a theoretical solution of a partial shell under uniform axial thermal gradient.

Paper Details

Date Published: 5 January 1984
PDF: 10 pages
Proc. SPIE 0450, Structural Mechanics of Optical Systems I, (5 January 1984); doi: 10.1117/12.939265
Show Author Affiliations
John W. Pepi, Itek Optical Systems (United States)
William P Barnes Jr., Itek Optical Systems (United States)

Published in SPIE Proceedings Vol. 0450:
Structural Mechanics of Optical Systems I
Lester M. Cohen, Editor(s)

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