Facility For Interferometric Testing Of 1.25-m Mirrors At Liquid Helium Temperatures

Louis J. Salerno; Ramsey K. Melugin

doi:10.1117/12.948347

27 April 1988 Facility For Interferometric Testing Of 1.25-m Mirrors At Liquid Helium Temperatures

Louis J. Salerno, Ramsey K. Melugin

Proceedings Volume 0973, Cryogenic Optical Systems and Instruments III; (1988) https://doi.org/10.1117/12.948347
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

A concept is presented for a national cryogenic optics test facility capable of optical characterization of 1.25-m-diameter optics having focal lengths up to 6.2 m at temperatures from 300 K to near 4 K. The facility will be comprised of a large Dewar with a phase-shift interferometer, a two-stage vacuum system employing a turbomolecular pump, and an integral vibration isolation system. The entire facility will be housed in a concrete site with a massive floor to assist in reducing vibration during optical tests. By providing interchangeable sections, the overall height of the Dewar can be adjusted to provide for testing of shorter focal length optics. This paper discusses the background for the facility, the facility location, and the requirements and the performance considerations which drive the Dewar design with respect to the vibration isolation system, vacuum system, and optical interferometry.

Citation Download Citation

Louis J. Salerno and Ramsey K. Melugin "Facility For Interferometric Testing Of 1.25-m Mirrors At Liquid Helium Temperatures", Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); https://doi.org/10.1117/12.948347

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