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Proceedings Paper

Changes In Surface Figure Due To Thermal Hysteresis
Author(s): S. F. Jacobs; S. C. Johnston; J. M. Sasian; M. Watson; J. D. Targove; D. Bass
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Paper Abstract

Thermal cycling hysteresis affects surface figure in low-expansivity mirror substrates. Zerodur, ULE, and Cer-Vit 8-in.-diameter mirrors and dilatometer samples were thermally cycled at uniform rates of 6 K/hr and 60 K/hr, and somewhat faster for nonuniform heating. Figure distortions as large as λ/10 were observed following nonuniform heating of standard Zerodur, which was the only material exhibiting thermal hysteresis. A new experimental Zerodur appears to be free of this problem.

Paper Details

Date Published: 1 January 1987
PDF: 11 pages
Proc. SPIE 0817, Optomechanical Systems Engineering, (1 January 1987); doi: 10.1117/12.967424
Show Author Affiliations
S. F. Jacobs, University of Arizona (United States)
S. C. Johnston, University of Arizona (United States)
J. M. Sasian, University of Arizona (United States)
M. Watson, University of Arizona (United States)
J. D. Targove, University of Arizona (United States)
D. Bass, University of Arizona (United States)

Published in SPIE Proceedings Vol. 0817:
Optomechanical Systems Engineering
Daniel Vukobratovich, Editor(s)

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