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Proceedings Paper

Fabrication of off-axis optical segments
Author(s): Robert A. Jones
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Paper Abstract

The construction of a very large optical telescopes can be prohibitively costly due to the massive weight of conventional primary mirrors. The cost of such telescopes can be reduced by the use of a segmented lightweight primary mirror. An Itek process, computer controlled optical surfacing (CCOS), is ideally suited for manufacturing the off-axis aspheric segments. During CCOS operations, a subaperture tool is moved across the optic surface under accurate computer control. By altering the time that the machine grinds or polishes each surface region, accurate and rapid figure progress can be achieved. This CCOS technology is described including machine control, figuring process, pad-to-surface fit, vacuum grinding/polishing, and optic edge figuring. The utilization of CCOS to fabricate seven similar, thin, 2-meter, off- axis, aspheric optics and a lightweighted, active, off-axis mirror is related. Also, the paper summarizes the ongoing manufacture of a large active off-axis aspheric.

Paper Details

Date Published: 10 December 1992
PDF: 10 pages
Proc. SPIE 1752, Current Developments in Optical Design and Optical Engineering II, (10 December 1992); doi: 10.1117/12.130721
Show Author Affiliations
Robert A. Jones, Litton Itek Optical Systems (United States)

Published in SPIE Proceedings Vol. 1752:
Current Developments in Optical Design and Optical Engineering II
Robert E. Fischer; Warren J. Smith, Editor(s)

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