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Coronagraph experiment on dark-hole control by speckle area nulling method

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Abstract

In high-contrast imaging optical systems for direct observation of planets outside our solar system, adaptive optics with an accuracy of λ/10,000 root mean square is required to reduce the speckle noise down to 1 × 10−10 level in addition to the nulling coronagraph which eliminate the diffracted light. We developed the speckle area nulling (SAN) method as a new dark-hole control algorithm which is capable of controlling speckle electric field in a wide area quickly, despite an extension of speckle nulling, and is robust not relying upon an optical model. We conducted a validation experiment for the SAN method with a monochromatic light and succeeded in reducing the intensity of areal speckles by 4.4 × 10−2.

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Acknowledgments

A part of this work was supported by Grants-in-Aid (No. 24360029) from the MEXT. This experiment was being performed in the optical experiment facility of Advanced Technology Center of NAOJ.

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Correspondence to Masahito Oya.

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Oya, M., Nishikawa, J., Horie, M. et al. Coronagraph experiment on dark-hole control by speckle area nulling method. Opt Rev 22, 736–740 (2015). https://doi.org/10.1007/s10043-015-0118-1

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