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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 31 — Nov. 1, 2010
  • pp: G140–G147

Automatic sensitivity adjustment for a curvature sensor

Aglae Kellerer, Mark Chun, and Christ Ftaclas  »View Author Affiliations


Applied Optics, Vol. 49, Issue 31, pp. G140-G147 (2010)
http://dx.doi.org/10.1364/AO.49.00G140


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Abstract

There are different techniques for sensing wavefront phase distortions due to atmospheric turbulence. Curvature sensors are practical because their sensitivity is adjustable to the prevailing atmospheric conditions. Even at the best sites, the turbulence intensity has been found to vary at times over only a few minutes and regularly over longer periods. Two methods to automatically adjust the sensitivity of a curvature sensor are proposed: First, the defocus distance can be adjusted prior to the adaptive-optics (AO) loop through the acquisition of a long-exposure image and can then be kept constant. Second, the defocus distance can be changed during the AO loop, based on the voltage values sent to the deformable mirror. We demonstrate that the performance increase—assessed in terms of the image Strehl ratio—can be significant.

© 2010 Optical Society of America

OCIS Codes
(110.0115) Imaging systems : Imaging through turbulent media
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Wavefront Sensors

History
Original Manuscript: March 3, 2010
Revised Manuscript: July 12, 2010
Manuscript Accepted: July 29, 2010
Published: September 8, 2010

Citation
Aglae Kellerer, Mark Chun, and Christ Ftaclas, "Automatic sensitivity adjustment for a curvature sensor," Appl. Opt. 49, G140-G147 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-31-G140


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