Cryogenic Optical Tests Of A Lightweight HIP Beryllium Mirror

R K Melugin; J. H. Miller; J. A. Young; S. D. Howard; G. M. Pryor

doi:10.1117/12.948340

27 April 1988 Cryogenic Optical Tests Of A Lightweight HIP Beryllium Mirror

R K Melugin, J. H. Miller, J. A. Young, S. D. Howard, G. M. Pryor

Proceedings Volume 0973, Cryogenic Optical Systems and Instruments III; (1988) https://doi.org/10.1117/12.948340
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

Five interferometric tests were conducted at cryogenic temperatures on a lightweight, 50 cm diameter, hot isostatic pressed (HIP) beryllium mirror in the Ames Research Center (ARC) Cryogenic Optics Test Facility. The purpose of the tests was to determine the stability of the mirror's figure when cooled to cryogenic temperatures. Test temperatures ranged from room ambient to 8 K. One cycle to 8 K and five cycles to 80 K were performed. Optical and thermal test methods are described. Data is presented to show the amount of cryogenic distortion and hysteresis present in the mirror when measured with an earlier, Shack interferometer, and with a newly-acquired, phase-measuring interferometer.

Citation Download Citation

R K Melugin, J. H. Miller, J. A. Young, S. D. Howard, and G. M. Pryor "Cryogenic Optical Tests Of A Lightweight HIP Beryllium Mirror", Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); https://doi.org/10.1117/12.948340

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