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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 32 — Nov. 10, 2009
  • pp: 6392–6399

Active hexagonally segmented mirror to investigate new optical phasing technologies for segmented telescopes

Frédéric Gonté, Christophe Dupuy, Bruno Luong, Christoph Frank, Roland Brast, and Baback Sedghi  »View Author Affiliations


Applied Optics, Vol. 48, Issue 32, pp. 6392-6399 (2009)
http://dx.doi.org/10.1364/AO.48.006392


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Abstract

The primary mirror of the future European Extremely Large Telescope will be equipped with 984 hexagonal segments. The alignment of the segments in piston, tip, and tilt within a few nanometers requires an optical phasing sensor. A test bench has been designed to study four different optical phasing sensor technologies. The core element of the test bench is an active segmented mirror composed of 61 flat hexagonal segments with a size of 17 mm side to side. Each of them can be controlled in piston, tip, and tilt by three piezoactuators with a precision better than 1 nm. The context of this development, the requirements, the design, and the integration of this system are explained. The first results on the final precision obtained in closed-loop control are also presented.

© 2009 Optical Society of America

OCIS Codes
(120.4610) Instrumentation, measurement, and metrology : Optical fabrication
(220.1080) Optical design and fabrication : Active or adaptive optics

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: July 29, 2009
Revised Manuscript: October 13, 2009
Manuscript Accepted: October 14, 2009
Published: November 9, 2009

Citation
Frédéric Gonté, Christophe Dupuy, Bruno Luong, Christoph Frank, Roland Brast, and Baback Sedghi, "Active hexagonally segmented mirror to investigate new optical phasing technologies for segmented telescopes," Appl. Opt. 48, 6392-6399 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-32-6392

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