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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 25 — Sep. 1, 2000
  • pp: 4706–4714

Phasing the mirror segments of the Keck telescopes II: the narrow-band phasing algorithm

Gary Chanan, Catherine Ohara, and Mitchell Troy  »View Author Affiliations


Applied Optics, Vol. 39, Issue 25, pp. 4706-4714 (2000)
http://dx.doi.org/10.1364/AO.39.004706


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Abstract

In a previous paper, we described a successful technique, the broadband algorithm, for phasing the primary mirror segments of the Keck telescopes to an accuracy of 30 nm. Here we describe a complementary narrow-band algorithm. Although it has a limited dynamic range, it is much faster than the broadband algorithm and can achieve an unprecedented phasing accuracy of approximately 6 nm. Cross checks between these two independent techniques validate both methods to a high degree of confidence. Both algorithms converge to the edge-minimizing configuration of the segmented primary mirror, which is not the same as the overall wave-front-error-minimizing configuration, but we demonstrate that this distinction disappears as the segment aberrations are reduced to zero.

© 2000 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

History
Original Manuscript: January 10, 2000
Revised Manuscript: May 30, 2000
Published: September 1, 2000

Citation
Gary Chanan, Catherine Ohara, and Mitchell Troy, "Phasing the mirror segments of the Keck telescopes II: the narrow-band phasing algorithm," Appl. Opt. 39, 4706-4714 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-25-4706

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