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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 17, Iss. 7 — Jul. 1, 2000
  • pp: 1325–1332

Control of the unilluminated deformable mirror actuators in an altitude-conjugated adaptive optics system

Jean-Pierre Véran  »View Author Affiliations


JOSA A, Vol. 17, Issue 7, pp. 1325-1332 (2000)
http://dx.doi.org/10.1364/JOSAA.17.001325


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Abstract

Off-axis observations made with adaptive optics are severely limited by anisoplanatism errors. However, conjugating the deformable mirror to an optimal altitude can reduce these errors; it is then necessary to control, through extrapolation, actuators that are not measured by the wave-front sensor (unilluminated actuators). In this study various common extrapolation schemes are investigated, and an optimal method that achieves a significantly better performance is proposed. This extrapolation method involves a simple matrix multiplication and will be implemented in ALTAIR, the Gemini North Telescope adaptive optics system located on Mauna Kea, Hawaii. With this optimal method, the relative H-band Strehl reduction due to extrapolation errors is only 5%, 16%, and 30% when the angular distance between the guide source and the science target is 20, 40 and 60 arc sec, respectively. For a site such as Mauna Kea, these errors are largely outweighed by the increase in the size of the isoplanatic field.

© 2000 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.7060) Atmospheric and oceanic optics : Turbulence
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(110.6770) Imaging systems : Telescopes
(350.1260) Other areas of optics : Astronomical optics

History
Original Manuscript: June 1, 1999
Revised Manuscript: November 15, 1999
Manuscript Accepted: November 15, 1999
Published: July 1, 2000

Citation
Jean-Pierre Véran, "Control of the unilluminated deformable mirror actuators in an altitude-conjugated adaptive optics system," J. Opt. Soc. Am. A 17, 1325-1332 (2000)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-17-7-1325


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References

  1. R. Racine, B. Ellerbroek, “Profiles of night-time turbulence above Mauna Kea and isoplanatism extension in adaptive optics,” in Adaptive Optical Systems and Applications, R. K. Tyson, R. Q. Fugate, eds., Proc. SPIE2534, 248–257 (1995). [CrossRef]
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  6. G. Herriot, National Research Council of Canada, Herzberg Institute of Astrophysics, Victoria, British Columbia V8X 4M6, Canada (personal communication, 1998).
  7. E. Gendron, “Optimisation de la commande modale en optique adaptive: application à l’astronomie,” Ph.D. dissertation (Université de Paris VII–Denis Diderot, Paris, 1995).

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