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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 15 — May. 20, 2009
  • pp: 2932–2941

Active Optics: stress polishing of toric mirrors for the VLT SPHERE adaptive optics system

Emmanuel Hugot, Marc Ferrari, Kacem El Hadi, Pascal Vola, Jean Luc Gimenez, Gérard R. Lemaitre, Patrick Rabou, Kjetil Dohlen, Pascal Puget, Jean Luc Beuzit, and Norbert Hubin  »View Author Affiliations

Applied Optics, Vol. 48, Issue 15, pp. 2932-2941 (2009)

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The manufacturing of toric mirrors for the Very Large Telescope–Spectro-Polarimetric High-Contrast Exoplanet Research instrument (SPHERE) is based on Active Optics and stress polishing. This figuring technique allows minimizing mid and high spatial frequency errors on an aspherical surface by using spherical polishing with full size tools. In order to reach the tight precision required, the manufacturing error budget is described to optimize each parameter. Analytical calculations based on elasticity theory and finite element analysis lead to the mechanical design of the Zerodur blank to be warped during the stress polishing phase. Results on the larger ( 366 mm diameter) toric mirror are evaluated by interferometry. We obtain, as expected, a toric surface within specification at low, middle, and high spatial frequencies ranges.

© 2009 Optical Society of America

OCIS Codes
(220.1000) Optical design and fabrication : Aberration compensation
(220.1250) Optical design and fabrication : Aspherics
(220.4610) Optical design and fabrication : Optical fabrication
(220.5450) Optical design and fabrication : Polishing
(220.1080) Optical design and fabrication : Active or adaptive optics

ToC Category:
Optical Design and Fabrication

Original Manuscript: January 27, 2009
Revised Manuscript: April 21, 2009
Manuscript Accepted: April 29, 2009
Published: May 18, 2009

Emmanuel Hugot, Marc Ferrari, Kacem El Hadi, Pascal Vola, Jean Luc Gimenez, Gérard R. Lemaitre, Patrick Rabou, Kjetil Dohlen, Pascal Puget, Jean Luc Beuzit, and Norbert Hubin, "Active Optics: stress polishing of toric mirrors for the VLT SPHERE adaptive optics system," Appl. Opt. 48, 2932-2941 (2009)

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