28 August 2014 Extreme lightweight ZERODUR mirrors (ELZM): supporting characteristics for spaceborne applications
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Abstract
Extreme Lightweight ZERODUR® Mirrors (ELZM) have been developed expressly to provide architects of spaceborne missions a new, cost-effective, option for implementation of medium and large Optical Telescope Assemblies (OTAs, up to 4+ meters in diameter). ZERODUR® is a traditional material in space with over a 30 year heritage. We will discuss the attributes of the material and fabrication methods to aggressively reduce weight to an extent now routinely available. Recent and emerging independent measurements of material properties will confirm the utility of this approach for new generations of OTAs. Data on dimensional stability over a broad practical temperature range will be referenced, as will recent mechanical strength data. Other data confirming suitability for use in space will be referenced. We will discuss how this data can be used for the architecture of a ELZM based cost-effective spaceborne OTA.
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Tony Hull, Thomas Westerhoff, "Extreme lightweight ZERODUR mirrors (ELZM): supporting characteristics for spaceborne applications", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91431V (28 August 2014); doi: 10.1117/12.2056993; https://doi.org/10.1117/12.2056993
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