2000
DOI: 10.1364/josaa.17.001819
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Isoplanatism in a multiconjugate adaptive optics system

Abstract: Turbulence correction in a large field of view by use of an adaptive optics imaging system with several deformable mirrors (DM's) conjugated to various heights is considered. The residual phase variance is computed for an optimized linear algorithm in which a correction of each turbulent layer is achieved by applying a combination of suitably smoothed and scaled input phase screens to all DM's. Finite turbulence outer scale and finite spatial resolution of the DM's are taken into account. A general expression … Show more

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Cited by 84 publications
(68 citation statements)
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“…Relative estimation errors in the Fried parameter r 0 , the isoplanatic angle 0 , and the generalized dualconjugate isoplanatic angle 2 [19] are all within a few percent after a few hundred frames of accumulated measurements.…”
Section: Turbulence Profiling Is Intrinsically Performed At Nonequispmentioning
confidence: 88%
“…Relative estimation errors in the Fried parameter r 0 , the isoplanatic angle 0 , and the generalized dualconjugate isoplanatic angle 2 [19] are all within a few percent after a few hundred frames of accumulated measurements.…”
Section: Turbulence Profiling Is Intrinsically Performed At Nonequispmentioning
confidence: 88%
“…For LGS MCAO, multiple low-order NGS WFSs are required to correct low-order tomographic nullmodes invisible to the high-order LGS WFSs but producing absolute and differential magnification on the science focal plane [15], commonly referred to as tip/ tilt anisoplanatism (TTA). More importantly, the effects of angular and focal anisoplanatism are very different from what they are for LGS GLAO and SCAO: the PSF is much more uniform across an extended FoV (characterized by the generalized isoplanatic angle [16]) and the TTR SR of a point source at infinity (science target) is actually larger than that of a point source in the same direction but at finiterange (the LGS of the multi-LGS constellation pointing to the science target), since the deformable mirror (DM) fitting step is optimized for the science target at infinity, not for the finite range LGSs. The…”
Section: Introductionmentioning
confidence: 90%
“…0.62 arcsec at 500 nm). The profile isoplanatic angle is 2.2 arcsec, and the 2 DM generalized isoplanatic angle [16] for a DM conjugation range of 11.2 km is 8.2 arcsec. The Greenwood frequency is 22 Hz.…”
Section: Performance Evaluationmentioning
confidence: 96%
“…Classical adaptive optics, which uses a single deformable mirror, provides correction for a limited field of view (FOV). Larger FOV corrections can be achieved by several deformable mirrors optically conjugated at various heights [30][31][32][33]. In modeling images with distortion caused by atmospheric turbulence, light from each point in the acquired scene is assumed to possess a slightly different tilt and low-order aberration, and it can be modeled by convolving a raw image with a space-variant pseudorandom point spread function [34].…”
Section: Channel Characterization and Processing Principlesmentioning
confidence: 99%