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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 7 — Mar. 1, 1996
  • pp: 1126–1128

Comparison of two high-precision nondestructive measurement methods for evaluating thermal expansion differences in the 8.3-m ultralow-expansion Subaru primary mirror blank

Henry E. Hagy and Michael E. Best  »View Author Affiliations


Applied Optics, Vol. 35, Issue 7, pp. 1126-1128 (1996)
http://dx.doi.org/10.1364/AO.35.001126


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Abstract

The building blocks for fabricating the 8.3-m Subaru primary mirror blank are ultralow-expansin solid hexagonal units that were subjected to rigorous ultrasonic examination to establish thermal expansion characterization as reported by Hagy [Appl. Opt. 12, 1440 (1973)]. Following assembly of the mirror by fusion and fine annealing, photoelastic analyses at hex-to-hex seals were used to calculate thermal expansion differences. These differences are found to be in excellent agreement with the ultrasonically established differences.

© 1996 Optical Society of America

History
Original Manuscript: July 21, 1995
Revised Manuscript: October 23, 1995
Published: March 1, 1996

Citation
Henry E. Hagy and Michael E. Best, "Comparison of two high-precision nondestructive measurement methods for evaluating thermal expansion differences in the 8.3-m ultralow-expansion Subaru primary mirror blank," Appl. Opt. 35, 1126-1128 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-7-1126

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