8 September 1995 Ultralightweight low-temperature fused Zerodur mirror
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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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jennifer Miller, Jennifer Miller, David Arthur Crowe, David Arthur Crowe, Patrick Clark, Patrick Clark, Alexander J. Marker, Alexander J. Marker, } "Ultralightweight low-temperature fused Zerodur mirror", Proc. SPIE 2536, Optical Manufacturing and Testing, (8 September 1995); doi: 10.1117/12.218447; https://doi.org/10.1117/12.218447
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