OSA's Digital Library

Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 18 — Aug. 27, 2012
  • pp: 19787–19798

Edges in CNC polishing: from mirror-segments towards semiconductors, paper 1: edges on processing the global surface

David Walker, Guoyu Yu, Hongyu Li, Wilhelmus Messelink, Rob Evans, and Anthony Beaucamp  »View Author Affiliations


Optics Express, Vol. 20, Issue 18, pp. 19787-19798 (2012)
http://dx.doi.org/10.1364/OE.20.019787


View Full Text Article

Enhanced HTML    Acrobat PDF (1474 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

Segment-edges for extremely large telescopes are critical for observations requiring high contrast and SNR, e.g. detecting exo-planets. In parallel, industrial requirements for edge-control are emerging in several applications. This paper reports on a new approach, where edges are controlled throughout polishing of the entire surface of a part, which has been pre-machined to its final external dimensions. The method deploys compliant bonnets delivering influence functions of variable diameter, complemented by small pitch tools sized to accommodate aspheric mis-fit. We describe results on witness hexagons in preparation for full size prototype segments for the European Extremely Large Telescope, and comment on wider applications of the technology.

© 2012 OSA

OCIS Codes
(110.6770) Imaging systems : Telescopes
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.5450) Optical design and fabrication : Polishing
(230.4040) Optical devices : Mirrors

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: June 7, 2012
Revised Manuscript: August 3, 2012
Manuscript Accepted: August 3, 2012
Published: August 14, 2012

Citation
David Walker, Guoyu Yu, Hongyu Li, Wilhelmus Messelink, Rob Evans, and Anthony Beaucamp, "Edges in CNC polishing: from mirror-segments towards semiconductors, paper 1: edges on processing the global surface," Opt. Express 20, 19787-19798 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-18-19787


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. P. Wehinger, “Steward Observatory Mirror Lab,” (accessed March. 2012) http://mirrorlab.as.arizona.edu/ .
  2. J. Nelson and T. S. Mast, “Construction of the Keck Observatory,” Proc. SPIE1236, 47–55 (1990). [CrossRef]
  3. P. Alvarez, J. M. Rodríguez Espinosa, and F. Sánchez, “The Gran Telescopio Canarias (GTC) project,” New Astron. Rev.42(6-8), 553–556 (1998). [CrossRef]
  4. H. M. Martin, J. H. Burge, B. Cuerden, W. B. Davison, J. S. Kingsley, W. C. Kittrell, R. D. Lutz, S. M. Miller, C. Zhao, and T. Zobrist, “Progress in manufacturing the first 8.4 m off-axis segment for the Giant Magellan Telescope,” Proc. SPIE7018, 70180C (2008). [CrossRef]
  5. J. Lubliner and J. E. Nelson, “Stressed Mirror Polishing. 1: A technique for producing nonaxisymmetric mirrors,” Appl. Opt.19(14), 2332–2340 (1980). [CrossRef] [PubMed]
  6. J. E. Nelson and G. M. Smith, “W. M. Keck Observatory,” Bull. Astron. Soc.22, 310 (1990).
  7. J. W. Pepi, “Test and theoretical comparisons for bending and springing of the Keck segmented 10 m telescope,” Opt. Eng.29(11), 1366–1372 (1990). [CrossRef]
  8. R. Gilmozzi and J. Spyromilio, “The European Extremely Large Telescope (E-ELT),” The Messenger127, 11–19 (2007).
  9. L. Christensen, “ESO moves one step closer to the first Extremely Large Telescope,” (accessed Sept. 2011) http://www.eso.org/public/announcements/ann11034/ .
  10. E. Swat, “ESO prototype segment specification,” E-SPE-ESO-300–0150 Issue 4, 29th July, (2009).
  11. X. Tonnellier, P. Morantz, P. Shore, and P. Comley, “Precision grinding for rapid fabrication of segments for extremely large telescopes using the Cranfield BoX,” Proc. SPIE7739, 773905, 773905-8 (2010). [CrossRef]
  12. P. Comley, P. Morantz, P. Shore, and X. Tonnellier, “Grinding metre scale mirror segments for the E-ELT ground based telescope,” CIRP Annals, Manufacturing Technology60(1), 379–382 (2011). [CrossRef]
  13. X. Tonnellier, P. Shore, P. Morantz, A. Baldwin, D. Walker, G. Yu, and R. Evans, “Sub surface damage issues for effective fabrication of large optics,” Proc. SPIE7018, 70180F, 70180F-10 (2008). [CrossRef]
  14. C. R. Dunn and D. D. Walker, “Pseudo-random tool paths for CNC sub-aperture polishing and other applications,” Opt. Express16(23), 18942–18949 (2008). [CrossRef] [PubMed]
  15. D. W. Kim, W. H. Park, S. W. Kim, and J. H. Burge, “Parametric modeling of edge effects for polishing tool influence functions,” Opt. Express17(7), 5656–5665 (2009). [CrossRef] [PubMed]
  16. F. W. Preston, “The theory and design of plate glass polishing machines,” J. Soc. Glass Technol.11, 214–256 (1927).
  17. G. Yu, H. Li, and D. D. Walker, “Removal of mid spatial-frequency features in mirror segments,” J. Eur. Opt. Soc. Rap. Pub.6, 11044 (2011). [CrossRef]
  18. C. Song, D. D. Walker, and G. Yu, “Misfit of rigid tools and interferometer sub-apertures on off-axis aspheric mirror segments,” Opt. Eng.50(7), 073401 (2011). [CrossRef]
  19. D. D. Walker, D. Brooks, A. King, R. Freeman, R. Morton, G. McCavana, and S. W. Kim, “The ‘Precessions’ tooling for polishing and figuring flat, spherical and aspheric surfaces,” Opt. Express11(8), 958–964 (2003). [CrossRef] [PubMed]
  20. H. Li, G. Yu, D. D. Walker, and R. Evans, “Modeling and measurement of polishing tool influence functions for edge control,” J. Eur. Opt. Soc. Rap. Pub.6, 11048 (2011).
  21. D. D. Walker, A. Beaucamp, C. Dunn, R. Evans, R. Freeman, R. Morton, X. Wei, and G. Yu, “Edge-control and surface-smoothness in sub-aperture polishing of mirror segments,” Proc. SPIE7018, 67–76 (2008).
  22. H. Jing, C. King, and D. D. Walker, “Measurement of influence function using swing arm profilometer and laser tracker,” Opt. Express18(5), 5271–5281 (2010). [CrossRef] [PubMed]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited