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Focal plane wave-front sensing algorithm for high-contrast imaging

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Abstract

High-contrast imaging provided by a coronagraph is critical for the direction imaging of the Earth-like planet orbiting its bright parent star. A major limitation for such direct imaging is the speckle noise that is induced from the wave-front error of an optical system. We derive an algorithm for the wave-front measurement directly from 3 focal plane images. The 3 images are achieved through a deformable mirror to provide specific phases for the optics system. We introduce an extra amplitude modulation on one deformable mirror configuration to create an uncorrelated wave-front, which is a critical procedure for wave-front sensing. The simulation shows that the reconstructed wave-front is consistent with the original wave-front theoretically, which indicates that such an algorithm is a promising technique for the wave-front measurement for the high-contrast imaging.

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Authors and Affiliations

  1. National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing, 210042, China

    JiangPei Dou, DeQing Ren, YongTian Zhu & Xi Zhang

  2. Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing, 210042, China

    JiangPei Dou, DeQing Ren, YongTian Zhu & Xi Zhang

  3. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China

    JiangPei Dou & Xi Zhang

  4. Physics & Astronomy Department, California State University Northridge, 18111 Nordhoff Street, Northridge, California, 91330-8268, USA

    DeQing Ren

Authors
  1. JiangPei Dou
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  2. DeQing Ren
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  3. YongTian Zhu
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  4. Xi Zhang
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Corresponding author

Correspondence to JiangPei Dou.

Additional information

Supported by the National Natural Science Foundation of China (Grant No. 10873024)

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Dou, J., Ren, D., Zhu, Y. et al. Focal plane wave-front sensing algorithm for high-contrast imaging. Sci. China Ser. G-Phys. Mech. Astron. 52, 1284–1288 (2009). https://doi.org/10.1007/s11433-009-0158-2

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  • DOI: https://doi.org/10.1007/s11433-009-0158-2

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