Fabrication and test of 1.8-meter-diameter high quality ULE mirror

Details Fabrication and test of 1.8-meter-diameter high quality ULE mirror Fabrication and test of 1.8-meter-diameter high quality ULE mirror

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975opten..14..539w&link_type=abstract

Optical Engineering, vol. 14, Nov.-Dec. 1975, p. 539-543.

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Hubble Space Telescope, Mirrors, Optical Measurement, Surface Distortion, Fabrication, Interferometry, Laser Applications

Scientific paper

The purpose of this investigation was to determine the feasibility of producing large diameter, high quality optical surfaces similar to those that will be required for some of the planned orbital observing units such as the Large Space Telescope (LST). An optical fabrication demonstration program was undertaken using an available 1.8-meter-diameter ULE monolithic mirror blank weighing on the order of 1,200 pounds. The mirror had no central perforation and was approximately 12 inches thick with 1-inch front- and back-plates. In order to accomplish this task, a variety of support and test equipment was designed and fabricated and the actual optical fabrication and test were conducted over a period of approximately eight months. The results of this effort yielded a mirror with a surface quality of 0.015 wave rms or lambda/65.3.

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