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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 1 — Jan. 1, 1998
  • pp: 140–155

Phasing the mirror segments of the Keck telescopes: the broadband phasing algorithm

Gary Chanan, Mitchell Troy, Frank Dekens, Scott Michaels, Jerry Nelson, Terry Mast, and David Kirkman  »View Author Affiliations


Applied Optics, Vol. 37, Issue 1, pp. 140-155 (1998)
http://dx.doi.org/10.1364/AO.37.000140


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Abstract

To achieve its full diffraction limit in the infrared, the primary mirror of the Keck telescope (now telescopes) must be properly phased: The steps or piston errors between the individual mirror segments must be reduced to less than 100 nm. We accomplish this with a wave optics variation of the Shack–Hartmann test, in which the signal is not the centroid but rather the degree of coherence of the individual subimages. Using filters with a variety of coherence lengths, we can capture segments with initial piston errors as large as ±30 μm and reduce these to 30 nm—a dynamic range of 3 orders of magnitude. Segment aberrations contribute substantially to the residual errors of ∼75 nm.

© 1998 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(040.1240) Detectors : Arrays
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

History
Original Manuscript: January 11, 1997
Revised Manuscript: July 29, 1997
Published: January 1, 1998

Citation
Gary Chanan, Mitchell Troy, Frank Dekens, Scott Michaels, Jerry Nelson, Terry Mast, and David Kirkman, "Phasing the mirror segments of the Keck telescopes: the broadband phasing algorithm," Appl. Opt. 37, 140-155 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-1-140

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