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Proceedings Paper

Design and manufacturing technologies for all-reflective collimators, relays, and derotating assemblies in cryovac instruments
Author(s): Michael N. Sweeney
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Paper Abstract

Aluminum mirrors are in increasingly common use for low background cryogenic radiometers, spectrometers, telescopes, collimators, scene generators, and black body reference targets used in the contexts of research in astronomy, and sensor system calibration and simulation. Reflective aluminum systems are relatively low cost, provide broadband performance, high thermal conductivity, and exceptionally isotropic thermal contraction. Aluminum optics may be net diamond point machined or nickel plated and post polished to yield more refined tolerances for surface figure and surface finish. Nickel plated mirrors must neutralize the influences of bi-metal interfaces over a large reduction in temperature. General design and manufacturing guidelines applied to three actual, and widely varied cryogenic reflective assemblies are presented. These applications were shown respectively to exhibit diffraction-limited performance in the range of 0.80-1.5 micron at cryogenic temperatures ranging from 20°K to 80°K.

Paper Details

Date Published: 25 November 2002
PDF: 11 pages
Proc. SPIE 4822, Cryogenic Optical Systems and Instruments IX, (25 November 2002);
Show Author Affiliations
Michael N. Sweeney, Axsys Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 4822:
Cryogenic Optical Systems and Instruments IX
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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