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| Paper: |
Development of the Speckle Area Nulling and Coherent Differential Imaging on Speckle Area Nulling |
| Monograph: |
11, HWO25 Proceedings Part II: Mission Framework, Technology, and Broader Contributions |
| Page: |
209 |
| Authors: |
Kenta Yoneta, Jun Nishikawa, Yutaka Hayano, Masatsugu Iribe, Kodai Yamamoto, Ryo Tsukui, Naoshi Murakami, Yosuke Tanaka, Motohide Tamura, Takahiro Sumi, Toru Yamada, Olivier Guyon, Julien Lozi, Vincent Deo, Sébastien Vievard, and Kyohoon Ahn^{14,2}z |
| DOI: |
10.26624/ZMMG6606 |
| Abstract: |
Discovering Earth-like exoplanets and detecting biosignatures are ultimate goals in exoplanets observation.
The high-contrast imaging system is an essential technology for achieving these goals.
This system consists mainly of a coronagraph, wavefront sensing and control (WFSC) technique, and post-processing technique to suppress diffracted stellar light by a telescope pupil, scattered stellar light (speckles) by wavefront aberrations, and residual stellar light due to other factors, respectively.
We have been developing the Speckle Area Nulling (SAN) method for WFSC and the Coherent Differential Imaging on Speckle Area Nulling (CDI-SAN) method for post-processing.
The SAN method can suppress static speckles without a light propagation model of the optical system.
However, conventional WFSC techniques, including the SAN method, cannot suppress speckles that fluctuate faster than the control.
The CDI-SAN method has been proposed to suppress such fluctuating speckles.
We have been conducting laboratory demonstrations of the SAN and the CDI-SAN methods. |
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