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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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References

  1. G. A. Chanan, M. Troy, F. G. Dekens, S. Michaels, J. Nelson, T. Mast, D. Kirkman, “Phasing the mirror segments of the Keck Telescopes: the broadband phasing algorithm,” Appl. Opt. 37, 140–155 (1998) [Paper 1].
  2. G. A. Chanan, M. Troy, “Strehl ratio and modulation transfer function for segmented mirror telescopes as functions of segment phase error,” Appl. Opt. 38, 6642–6647 (1999). [CrossRef]
  3. J. E. Nelson, T. S. Mast, S. M. Faber, “The design of the Keck Observatory and Telescope,” (W. M. Keck Observatory, Kamuela, Hawaii1985).
  4. R. W. Cohen, T. S. Mast, J. E. Nelson, “Performance of the W. M. Keck Telescope active mirror control system,” in Advanced Technology Optical Telescopes V, L. M. Stepp, ed., Proc. SPIE2199, 105–116 (1994). [CrossRef]
  5. G. A. Chanan, T. S. Mast, J. E. Nelson, “Keck telescope primary mirror segments: initial alignment and active control,” in European Southern Observatory Conference on Very Large Telescopes and their Instrumentation, M.-H. Ulrich, ed. (Garching, Germany, 1988), pp. 421–428.
  6. G. A. Chanan, J. Nelson, T. Mast, P. Wizinowich, B. Schaefer, “The W. M. Keck Telescope phasing camera system,” in Instrumentation in Astronomy VIII, D. L. Crawford, E. R. Craine, eds., Proc. SPIE2198, 1139–1150 (1994). [CrossRef]
  7. G. A. Chanan, “Design of the Keck Observatory alignment camera,” in Precision Instrument Design, T. C. Bristow, A. E. Hatheway, eds., Proc. SPIE1036, 59–70 (1988). [CrossRef]
  8. W. Press, B. Flannery, S. Teukolsky, W. Vetterling, Numerical Recipes: The Art of Scientific Computing (Cambridge University Press, New York, 1989), pp. 484–487.
  9. W. Press, B. Flannery, S. Teukolsky, W. Vetterling, Numerical Recipes: The Art of Scientific Computing (Cambridge University Press, New York, 1989), pp. 52–64, 515–520.
  10. M. G. Lofdahl, H. Eriksson, “Resolving piston ambiguities when phasing a segmented mirror,” in UV, Optical, and IR Space Telescopes and Instruments, J. B. Breckinridge, P. Jakobsen, eds., Proc. SPIE 4013 (to be published).
  11. J. E. Nelson, Lick Observatory, University of California, Santa Cruz, Calif. 95064 (personal communication, 1998).

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