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Proceedings Paper

Development of speckle nulling technique for the Savart-plate lateral-shearing interferometric nuller for exoplanets (SPLINE)
Author(s): Kenta Yoneta; Naoshi Murakami; Takayuki Kotani; Hajime Kawahara; Taro Matsuo; Naoshi Baba; Motohide Tamura
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Paper Abstract

The Savart-Plate Lateral-shearing Interferometric Nuller for Exoplanets (SPLINE) is a kind of a visible nulling coronagraph for directly detecting exoplanets. The SPLINE consists of two crossed polarizers and a Savart plate placed between them. Theoretically the SPLINE realizes perfect cancellation of starlight. However, achievable contrast is limited by residual stellar speckles due to wavefront aberration caused by imperfect optical surfaces of the optical elements. For reducing the residual stellar speckles of the SPLINE, we propose a speckle nulling technique using a Liquid-Crystal Spatial Light Modulator (LCSLM) to create a dark hole. For the speckle nulling, we apply the Self-Coherent Camera (SCC) technique to the SPLINE for wavefront sensing in the focal plane. We report our recent progress on computer simulation and preliminary laboratory experiments of the speckle nulling technique applied to the SPLINE.

Paper Details

Date Published: 22 July 2016
PDF: 8 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99126I (22 July 2016); doi: 10.1117/12.2231950
Show Author Affiliations
Kenta Yoneta, Hokkaido Univ. (Japan)
Naoshi Murakami, Hokkaido Univ. (Japan)
Takayuki Kotani, National Astronomical Observatory of Japan (Japan)
National Institutes of Natural Sciences (Japan)
Hajime Kawahara, The Univ. of Tokyo (Japan)
Taro Matsuo, Osaka Univ. (Japan)
Naoshi Baba, Muroran Institute of Technology (Japan)
Motohide Tamura, National Astronomical Observatory of Japan (Japan)
National Institutes of Natural Sciences (Japan)
The Univ. of Tokyo (Japan)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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