Changes in surface figure due to thermal hysteresis

S. F. Jacobs, S. C. Johnston, Jose M Sasian, M. Watson, J. D. Targove, D. Bass

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)193-203
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume817
DOIs
StatePublished - Jan 1 1987

ASJC Scopus subject areas

  • Applied Mathematics
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Computer Science Applications

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