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Proceedings Paper

Ultralightweight low-temperature fused Zerodur mirror
Author(s): Jennifer Miller; David Arthur Crowe; Patrick Clark; Alexander J. Marker
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Paper Abstract

The performance and utility of optical systems can be significantly improved by using lightweight stable mirror components. Such components have been incorporated into a mirror assembly through a process that utilizes low temperature fusion to bond low CTE faceplates onto a lightweight core structure. The core structure is fabricated using an abrasive waterjet cutting technique that enables the designer to optimize core geometry to enhance the structural performance of the blank. The faceplates are bonded to the lightweight core resulting in a stiff structural mirror. A 15.125 inch Zerodur mirror was fabricated using this unique process and subjected to a test program to measure the optical stability of the mirror in support of either space-based applications. Strength testing was performed to verify the integrity of the fused joints and determine appropriate design allowable stress. A thermal test program was designed to assess performance at various temperature extremes and a mechanical load test was run to verify the capability of the blank to withstand operational loads without degrading the optical surface. The surface figure of the part was measured before, during, and after a 200 degree F temperature cycle with no change in figure quality. In addition, the mirror was subjected to a 10 g load for ten minutes with no change in the figure quality.

Paper Details

Date Published: 8 September 1995
PDF: 5 pages
Proc. SPIE 2536, Optical Manufacturing and Testing, (8 September 1995); doi: 10.1117/12.218447
Show Author Affiliations
Jennifer Miller, Eastman Kodak Co. (United States)
David Arthur Crowe, Eastman Kodak Co. (United States)
Patrick Clark, Eastman Kodak Co. (United States)
Alexander J. Marker, Schott Glass Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 2536:
Optical Manufacturing and Testing
Victor J. Doherty; H. Philip Stahl, Editor(s)

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