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Proceedings Paper

Research on edge control in the process of polishing using ultra precise bonnet on optical elements
Author(s): Wei Wang; Min Xu; Guoyu Yu
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Paper Abstract

High-quality optical elements are very important in modern technology; in particular top-quality aspheric optical elements. The concept of an extremely large ground based telescope is a significant technical challenge particularly for the manufacture of the optical components necessary to realize the very demanding performance. Extremely large ground based telescopes require many high-quality, large-diameter optical elements for their construction. The method of optical polishing, using an ultra precise bonnet, is based upon the use of computer controlled fabrication of an optical surface. A bonnet filled with air is used as a precise polishing tool which is flexible and can adapt itself well to the shape of the part, compared with other polishing methods. As with other polishing techniques the edge quality is a key factor affecting the performance of the optical element. In this paper, the effects of edge performance are analyzed, and three compensating techniques are discussed. It is demonstrated that, good edge control can be achieved by using a special removal function applied to the polishing process. Some experimental results are shown and a consecutive polishing process is described.

Paper Details

Date Published: 13 October 2010
PDF: 9 pages
Proc. SPIE 7654, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 76540N (13 October 2010); doi: 10.1117/12.866699
Show Author Affiliations
Wei Wang, Shanghai Modern Advanced Ultra Precision Manufacturing Ctr. (China)
Min Xu, Fudan Univ. (China)
Guoyu Yu, Technium OpTIC (United Kingdom)

Published in SPIE Proceedings Vol. 7654:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Myung K. Cho; Fan Wu, Editor(s)

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