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Proceedings Paper

Lightweight SXA metal matrix composite collimator
Author(s): R. Barry Johnson; Anees Ahmad; James B. Hadaway; Alan L. Geiger
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Paper Abstract

The U.S. Army requires very light-weight collimators for use in man-portable photonic test sets. An investigation was performed to assess the performance and producibility of optical collimators fabricated from various materials. Due to the systems requirements, a large aperture collimator is needed. A full-scale rendering has been constructed with a light- weighted aluminum primary mirror with an electroless nickel overcoat and a SXA secondary mirror and support structure. Since the coefficient of thermal expansion (CTE) is quite different between aluminum and electroless nickel, the useful temperature range of the collimator is unacceptable. The SXA material CTE is almost the same as electroless nickel. Because of this characteristic and the unknown producibility of large-size off-axis aspheric mirrors being made of SXA, it was decided to fabricate a one-third scale rendering made entirely of SXA. Design and fabrication considerations are presented along with a weight comparison for equivalent collimators made of different materials. One observation is that a collimator made of beryllium will be less than 30% with weight of the others, although consideration of other factors must be given as well.

Paper Details

Date Published: 1 November 1991
PDF: 7 pages
Proc. SPIE 1535, Passive Materials for Optical Elements, (1 November 1991); doi: 10.1117/12.48310
Show Author Affiliations
R. Barry Johnson, Ctr. for Applied Optics/Univ. of Alabama in Huntsville (United States)
Anees Ahmad, Ctr. for Applied Optics/Univ. of Alabama in Huntsville (United States)
James B. Hadaway, Ctr. for Applied Optics/Univ. of Alabama in Huntsville (United States)
Alan L. Geiger, Advanced Composite Materials Corp. (United States)

Published in SPIE Proceedings Vol. 1535:
Passive Materials for Optical Elements
Gary W. Wilkerson, Editor(s)

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