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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 9 — May. 5, 2014
  • pp: 10761–10774

Edge effect modeling and experiments on active lap processing

Haitao Liu, Fan Wu, Zhige Zeng, Bin Fan, and Yongjian Wan  »View Author Affiliations

Optics Express, Vol. 22, Issue 9, pp. 10761-10774 (2014)

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Edge effect is regarded as one of the most difficult technical issues for fabricating large primary mirrors, especially for large polishing tools. Computer controlled active lap (CCAL) uses a large size pad (e.g., 1/3 to 1/5 workpiece diameters) to grind and polish the primary mirror. Edge effect also exists in the CCAL process in our previous fabrication. In this paper the material removal rules when edge effects happen (i.e. edge tool influence functions (TIFs)) are obtained through experiments, which are carried out on a Φ1090-mm circular flat mirror with a 375-mm-diameter lap. Two methods are proposed to model the edge TIFs for CCAL. One is adopting the pressure distribution which is calculated based on the finite element analysis method. The other is building up a parametric equivalent pressure model to fit the removed material curve directly. Experimental results show that these two methods both effectively model the edge TIF of CCAL.

© 2014 Optical Society of America

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.4610) Optical design and fabrication : Optical fabrication
(220.5450) Optical design and fabrication : Polishing

ToC Category:
Geometric Optics

Original Manuscript: January 6, 2014
Revised Manuscript: March 27, 2014
Manuscript Accepted: April 3, 2014
Published: April 28, 2014

Haitao Liu, Fan Wu, Zhige Zeng, Bin Fan, and Yongjian Wan, "Edge effect modeling and experiments on active lap processing," Opt. Express 22, 10761-10774 (2014)

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