Surface figure changes due to thermal cycling hysteresis

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

doi:10.1364/AO.26.004438

Surface figure changes due to thermal cycling hysteresis

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

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

How does thermal cycling hysteresis affect surface figure in low expansivity mirror substrates? Zerodur, ULE, and Cer-Vit 20.3-cm (8-in.) diam mirrors and dilatometer samples were thermally cycled at 6 and 60 K/h with uniform and nonuniform heating. Figure distortions as large as X/10 were observed only with 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 language	English (US)
Pages (from-to)	4438-4442
Number of pages	5
Journal	Applied optics
Volume	26
Issue number	20
DOIs	https://doi.org/10.1364/AO.26.004438
State	Published - Oct 15 1987

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Engineering (miscellaneous)
Electrical and Electronic Engineering

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10.1364/AO.26.004438

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AU - Jacobs, S. F.

AU - Johnston, S. C.

AU - Sasian, J. M.

AU - Watson, M.

AU - Targove, J. D.

AU - Bass, D.

PY - 1987/10/15

Y1 - 1987/10/15

N2 - How does thermal cycling hysteresis affect surface figure in low expansivity mirror substrates? Zerodur, ULE, and Cer-Vit 20.3-cm (8-in.) diam mirrors and dilatometer samples were thermally cycled at 6 and 60 K/h with uniform and nonuniform heating. Figure distortions as large as X/10 were observed only with nonuniform heating of standard Zerodur, which was the only material exhibiting thermal hysteresis. A new experimental Zerodur appears to be free of this problem.

AB - How does thermal cycling hysteresis affect surface figure in low expansivity mirror substrates? Zerodur, ULE, and Cer-Vit 20.3-cm (8-in.) diam mirrors and dilatometer samples were thermally cycled at 6 and 60 K/h with uniform and nonuniform heating. Figure distortions as large as X/10 were observed only with nonuniform heating of standard Zerodur, which was the only material exhibiting thermal hysteresis. A new experimental Zerodur appears to be free of this problem.

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Surface figure changes due to thermal cycling hysteresis

Abstract

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