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Proceedings Paper

Final surface error correction of an off-axis aspheric petal by ion figuring
Author(s): Lynn N. Allen; John J. Hannon; Richard W. Wambach Jr.
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Paper Abstract

The final surface figure error correction of a 1.3 m ULETM frit-bonded, ultra- lightweight, off-axis primary mirror petal was successfully completed using the ion figuring process. The petal was a concave aspheric optical element. Ion figuring is an optical fabrication method that provides highly controlled error correction of previously polished surfaces using a directed, inert and neutralized ion beam to physically sputter material from the optic surface. The surface figure error of the petal following conventional polishing was 5.02 (lambda) p-v, 0.62 (lambda) rms, and was improved to 0.17 (lambda) p-v, 0.015 (lambda) rms in four process (test-ion figure) iterations ((lambda) equals 632.8 nm). A multi-iteration process sequence was selected to address the various surface figure error volume and spatial frequency components and involved applying three different beam removal functions. The benefits of ion figuring a complex shaped optic using multiple figuring-testing iterations were clearly demonstrated.

Paper Details

Date Published: 13 January 1992
PDF: 11 pages
Proc. SPIE 1543, Active and Adaptive Optical Components, (13 January 1992); doi: 10.1117/12.51181
Show Author Affiliations
Lynn N. Allen, Eastman Kodak Co. (United States)
John J. Hannon, Eastman Kodak Co. (United States)
Richard W. Wambach Jr., Eastman Kodak Co. (United States)

Published in SPIE Proceedings Vol. 1543:
Active and Adaptive Optical Components
Mark A. Ealey, Editor(s)

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