0

Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

Progress in ion figuring large optics

[+] Author Affiliations
Lynn N. Allen

Eastman Kodak Co. (USA)

Proc. SPIE 2428, Laser-Induced Damage in Optical Materials: 1994, 237 (July 14, 1995); doi:10.1117/12.213776
Text Size: A A A
From Conference Volume 2428

  • Laser-Induced Damage in Optical Materials: 1994
  • Harold E. Bennett; Arthur H. Guenther; Mark R. Kozlowski; Brian E. Newnam; M. J. Soileau
  • Boulder, CO | October 24, 1994

abstract

Ion figuring is an optical fabrication method that provides deterministic surface figure error correction of previously polished surfaces by using a directed, inert, and neutralized ion beam to physically sputter material from the optic surface. Considerable process development has been completed and numerous large optical elements have been successfully final-figured using this process. The process has been demonstrated to be highly deterministic, capable of completing complex-shaped optical element configurations in only a few process iterations, and capable of achieving high- quality surface figure accuracies. A review of the neutral ion beam figuring process will be provided, along with discussion of processing results for several large optics. Most notably, processing of Keck 10 meter telescope primary mirror segments and correction of one other large optic where a convergence ratio greater than 50 was demostrated during the past year will be discussed. Also, the process has been demonstrated on various optical materials, including fused silica, ULE, zerodur, silicon, and chemically vapor deposited (CVD) silicon carbide. Where available, results of surface finish changes caused by the ion bombardment process will be discussed. Most data have shown only limited degradation of the optic surface finish, and that it is generally a function of the quality of mechanical polishing prior to ion figuring. Removals of from 5 to 10 micrometers on some materials are acceptable without adversely altering the surface finish specularity.

© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Lynn N. Allen
"Progress in ion figuring large optics", Proc. SPIE 2428, Laser-Induced Damage in Optical Materials: 1994, 237 (July 14, 1995); doi:10.1117/12.213776; http://dx.doi.org/10.1117/12.213776


Access This Article
Sign In to Access Full Content
Please Wait... Processing your request... Please Wait.
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
 

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Journal Articles

Related Book Chapters

Topic Collections

Advertisement


Buy this article ($18 for members, $25 for non-members).
Sign In