High-Contrast Imaging using Adaptive Optics for Extrasolar Planet Detection

Evans, Julia W.

doi:10.2172/900101

2006

DOI: 10.2172/900101

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High-Contrast Imaging using Adaptive Optics for Extrasolar Planet Detection

Julia W. Evans

Abstract: Direct imaging of extrasolar planets is an important, but challenging, next step in planetary science. Most planets identified to date have been detected indirectlynot by emitted or reflected light but through the effect of the planet on the parent star.

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2008

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Laboratory demonstration of accurate and efficient nanometer-level wavefront control for extreme adaptive optics

et al. 2008

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A 32 x 32 microelectricalmechanical systems mirror is controlled in a closed-loop adaptive optics test bed with a spatially filtered wavefront sensor (WFS), Fourier transform wavefront reconstruction, and calibration of references with a high-precision interferometer. When correcting the inherent aberration of the mirror, 0.7 nm rms phase error in the controllable band is achieved. When correcting an etched phase plate with atmospheric statistics, a dark hole 10(3) deeper than the uncontrollable phase is produced in the phase power spectral density. Compensation of the mirror's influence function is done with a Fourier filter, which results in improved loop convergence. Use of the spatial filter is shown to reduce the gain variability of the WFS in a quadcell configuration.

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Laboratory demonstration of accurate and efficient nanometer-level wavefront control for extreme adaptive optics

et al. 2008

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High-Contrast Imaging using Adaptive Optics for Extrasolar Planet Detection

Abstract: Direct imaging of extrasolar planets is an important, but challenging, next step in planetary science. Most planets identified to date have been detected indirectlynot by emitted or reflected light but through the effect of the planet on the parent star.

Cited by 1 publication

References 47 publications

Laboratory demonstration of accurate and efficient nanometer-level wavefront control for extreme adaptive optics

Laboratory demonstration of accurate and efficient nanometer-level wavefront control for extreme adaptive optics

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