Physics – Optics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012pasp..124..247r&link_type=abstract
Publications of the Astronomical Society of the Pacific, Volume 124, issue 913, pp.247-253
Physics
Optics
Scientific paper
The future direct imaging of exoplanets depends critically on wave-front corrections. Extreme adaptive optics is being proposed to meet such a critical requirement. One limitation to the performance of adaptive optics is the differential wave-front aberration that is not measured by a conventional wave-front sensor because of the so-called non--common-path error. In this article, we propose a simple approach that can be used to eliminate differential aberration with extreme adaptive optics and is optimized for best image performance or directly optimized for high-contrast coronagraphic imaging. The approach that we propose can correct differential aberration in a single step, which guarantees high accuracy and allows adaptive optics to correct the differential aberration on a real-time scale. This approach is based on an iterative optimization algorithm that commands the deformable mirror directly and uses the focal-plane point-spread function as a metric function to evaluate the correction performance.
Christian Damian Joseph
Dong Bing
Ren Deqing
Zhu Yongtian
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