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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 17 — Jun. 10, 2011
  • pp: 2708–2718

On-sky multiwavelength phasing of segmented telescopes with the Zernike phase contrast sensor

Arthur Vigan, Kjetil Dohlen, and Silvio Mazzanti  »View Author Affiliations


Applied Optics, Vol. 50, Issue 17, pp. 2708-2718 (2011)
http://dx.doi.org/10.1364/AO.50.002708


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Abstract

Future extremely large telescopes will adopt segmented primary mirrors with several hundreds of segments. Cophasing of the segments together is essential to reach high wavefront quality. The phasing sensor must be able to maintain very high phasing accuracy during the observations, while being able to phase segments dephased by several micrometers. The Zernike phase contrast sensor has been demonstrated on-sky at the Very Large Telescope. We present the multiwavelength scheme that has been implemented to extend the capture range from ± λ / 2 on the wavefront to many micrometers, demonstrating that it is successful at phasing mirrors with piston errors up to ± 4.0 μm on the wavefront. We discuss the results at different levels and conclude with a phasing strategy for a future extremely large telescope.

© 2011 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(350.1260) Other areas of optics : Astronomical optics

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: October 19, 2010
Revised Manuscript: February 5, 2011
Manuscript Accepted: March 26, 2011
Published: June 8, 2011

Citation
Arthur Vigan, Kjetil Dohlen, and Silvio Mazzanti, "On-sky multiwavelength phasing of segmented telescopes with the Zernike phase contrast sensor," Appl. Opt. 50, 2708-2718 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-17-2708

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