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29 January 1989 Polishing And Aspherizing A 1.8-m f/2.7 Paraboloid
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In late December of 1987, the Optical Sciences Center at the University of Arizona completed a seventh primary mirror for the Multiple Mirror Telescope (located on Mt. Hopkins in southern Arizona). The spare mirror allowed astronomers to maintain a six-mirror configuration while one mirror was down for realuminizing or when repairs to its support system were being carried out. Weather at the southern Arizona site is so ideal that a higher-precision mirror was needed to take advantage of these atmospheric conditions. 'When the specifications were considered, it became apparent that standard fabrication techniques would have to be altered somewhat to achieve a successful mirror. The problems considered were print through, or quilting of the mirror's ribs onto the optical surface, the possibility of astigmatism developing (tests indicated the blank lacked uniform strength across the back), and the necessity to maintain a precise focal length.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert Crawford and Dave Anderson "Polishing And Aspherizing A 1.8-m f/2.7 Paraboloid", Proc. SPIE 0966, Advances in Fabrication and Metrology for Optics and Large Optics, (29 January 1989);


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