Overcoming turbulence-induced space-variant blur by using phase-diverse speckle
JOSA A, Vol. 26, Issue 1, pp. 206-218 (2009)
http://dx.doi.org/10.1364/JOSAA.26.000206
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Abstract
Space-variant blur occurs when imaging through volume turbulence over sufficiently large fields of view. Space-variant effects are particularly severe in horizontal-path imaging, slant-path (air-to-ground or ground-to-air) geometries, and ground-based imaging of low-elevation satellites or astronomical objects. In these geometries, the isoplanatic angle can be comparable to or even smaller than the diffraction-limited resolution angle. We report on a postdetection correction method that seeks to correct for the effects of space-variant aberrations, with the goal of reconstructing near-diffraction-limited imagery. Our approach has been to generalize the method of phase-diverse speckle (PDS) by using a physically motivated distributed-phase-screen model. Simulation results are presented that demonstrate the reconstruction of near-diffraction-limited imagery under both matched and mismatched model assumptions. In addition, we present evidence that PDS could be used as a beaconless wavefront sensor in a multiconjugate adaptive optics system when imaging extended scenes.
© 2008 Optical Society of America
OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(100.3020) Image processing : Image reconstruction-restoration
(100.3190) Image processing : Inverse problems
(110.6150) Imaging systems : Speckle imaging
ToC Category:
Imaging Systems
History
Original Manuscript: June 9, 2008
Revised Manuscript: September 29, 2008
Manuscript Accepted: October 20, 2008
Published: December 24, 2008
Citation
Brian J. Thelen, Richard G. Paxman, David A. Carrara, and John H. Seldin, "Overcoming turbulence-induced space-variant blur by using phase-diverse speckle," J. Opt. Soc. Am. A 26, 206-218 (2009)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-26-1-206
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