Physics – Optics
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975sshm.meetq....w&link_type=abstract
AAS, AIAA, IEEE, ORSA, and IMS, Meeting on Space Shuttle Missions of the 80's, Denver, Colo., Aug. 26-28, 1975, AAS 12 p.
Physics
Optics
Hubble Space Telescope, Lens Design, Nondestructive Tests, Optical Measurement, Paraboloid Mirrors, Cassegrain Optics, Computer Techniques, Fabrication, Laser Applications, Quality Control
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). Current requirements for the Large Space Telescope require that a wavelength/20 rms wavefront be produced at the Cassegrain focus. A reasonable distribution of error sources would, therefore, demand that the primary mirror be figured to a tolerance of wavelength/64 rms on the surface. 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 that was used 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 8 months. The results of this effort yielded a mirror with a surface quality of 0.015 wave rms.
Rose C. A.
Wollensak Richard J.
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