27 April 1988 Facility For Interferometric Testing Of 1.25-m Mirrors At Liquid Helium Temperatures
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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.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Louis J. Salerno, Louis J. Salerno, Ramsey K. Melugin, 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); doi: 10.1117/12.948347; https://doi.org/10.1117/12.948347
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