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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 33 — Nov. 20, 2011
  • pp: 6283–6293

Fresnel phasing of segmented mirror telescopes

Gary Chanan, Mitchell Troy, Isabelle Surdej, Gary Gutt, and Lewis C. Roberts, Jr.  »View Author Affiliations

Applied Optics, Vol. 50, Issue 33, pp. 6283-6293 (2011)

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Shack-Hartmann (S-H) phasing of segmented telescopes is based upon a physical optics generalization of the geometrical optics Shack-Hartmann test, in which each S-H lenslet straddles an intersegment edge. For the extremely large segmented telescopes currently in the design stages, one is led naturally to very large pupil demagnifications for the S-H phasing cameras. This in turn implies rather small Fresnel numbers F for the lenslets; the nominal design for the Thirty Meter Telescope calls for F = 0.6 . For such small Fresnel numbers, it may be possible to eliminate the lenslets entirely, replacing them with a simple mask containing a sparse array of clear subapertures and thereby also eliminating a number of manufacturing problems and experimental complications associated with lenslets. We present laboratory results that demonstrate the validity of this approach.

© 2011 Optical Society of America

OCIS Codes
(110.6770) Imaging systems : Telescopes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: August 15, 2011
Manuscript Accepted: September 1, 2011
Published: November 18, 2011

Gary Chanan, Mitchell Troy, Isabelle Surdej, Gary Gutt, and Lewis C. Roberts, Jr., "Fresnel phasing of segmented mirror telescopes," Appl. Opt. 50, 6283-6293 (2011)

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