Lightweight athermal optical system using silicon lightweight mirrors (SLMS) and carbon fiber reinforced silicon carbide (Cesic) mounts

William A. Goodman; Marc T. Jacoby; Matthias Kroedel; David A. Content

doi:10.1117/12.452339

25 November 2002 Lightweight athermal optical system using silicon lightweight mirrors (SLMS) and carbon fiber reinforced silicon carbide (Cesic) mounts

William A. Goodman, Marc T. Jacoby, Matthias Kroedel, David A. Content

Author Affiliations +

Proceedings Volume 4822, Cryogenic Optical Systems and Instruments IX; (2002) https://doi.org/10.1117/12.452339
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

A lightweight athermal optical system has been demonstrated using silicon lightweight mirrors (SLMS) manufactured by Schafer Corporation, mounted in carbon fiber reinforced silicon carbide mounts (C/SiC or Cesic) produced by IABG and ECM. SLMS are quickly and inexpensively super-polishable (figure of 0.021 waves rms @ 633 nm, 4 Å rms surface finish), stiff (first mode greater than 1500 Hz), lightweight (areal density <10 kg/m²), have superior thermal properties at cryogenic temperatures, and do not out-gas. Under a 1998 NASA Phase I SBIR, Schafer and IABG engineered the so-called A-3 formulation of Cesic, which has a near-perfect CTE match with silicon over the temperature range of 8-300 K, making it the ideal material to athermally mount SLMS. This paper presents results of the cryogenic testing of a 6-inch diameter flat SLMS-Cesic mount assembly at NASA GSFC from room temperature to 80K and back again.

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William A. Goodman, Marc T. Jacoby, Matthias Kroedel, and David A. Content "Lightweight athermal optical system using silicon lightweight mirrors (SLMS) and carbon fiber reinforced silicon carbide (Cesic) mounts", Proc. SPIE 4822, Cryogenic Optical Systems and Instruments IX, (25 November 2002); https://doi.org/10.1117/12.452339

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