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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

  • Editor: Stephen A. Burns
  • Vol. 23, Iss. 8 — Aug. 1, 2006
  • pp: 1914–1923

Adaptive optics compensation for propagation through deep turbulence: initial investigation of gradient descent tomography

Glenn A. Tyler  »View Author Affiliations


JOSA A, Vol. 23, Issue 8, pp. 1914-1923 (2006)
http://dx.doi.org/10.1364/JOSAA.23.001914


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Abstract

To implement adaptive optics compensation for propagation through deep turbulence, the concept of gradient descent tomography has been developed. Here two or more deformable mirrors are controlled by an efficient iterative algorithm that optimizes the integral I 2 image-sharpening metric. In this work a difficult case involving imaging over a 2 km path with a C n 2 of 2 × 10 13 m 2 3 is considered. For a wavelength of 1.06 μ m and a 10-cm-diameter aperture, λ D is seven times the isoplanatic angle ( ϑ 0 = 1.54 μ rad ) , and the Rytov number is 5.5. For three points placed along a line spanning approximately 70 isoplanatic patch sizes all three points are compensated somewhat, illustrating that anisoplanatism is addressed. The fact that the corresponding performance improvement ratios are 1.20, 1.34, and 3.26 in the presence of such strong scintillation and anisoplanatism is quite significant.

© 2006 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: July 29, 2005
Revised Manuscript: December 20, 2005
Manuscript Accepted: January 13, 2006

Citation
Glenn A. Tyler, "Adaptive optics compensation for propagation through deep turbulence: initial investigation of gradient descent tomography," J. Opt. Soc. Am. A 23, 1914-1923 (2006)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-23-8-1914

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