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Proceedings Paper

Laboratory demonstration of the Savart-plate lateral-shearing interferometric nuller for exoplanets (SPLINE)
Author(s): Hirofumi Kitou; Naoshi Murakami; Manabu Kida; Naoshi Baba; Taro Matsuo; Takayuki Kotani; Hajime Kawahara; Motohide Tamura
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Paper Abstract

We have developed the Savart-Plate Lateral-shearing Interferometric Nuller for Exoplanets (SPLINE), which is a kind of a nulling interferometer, for directly imaging exoplanets. The SPLINE consists of two polarizers and a Savart plate between them. The SPLINE can theoretically obtain fully achromatic and stable nulled output. However, a drawback of the SPLINE is its low system throughput due to the polarizers. For improving the system throughput, we propose a dualchannel SPLINE using polarization beam splitters instead of the polarizers. We have carried out laboratory demonstration of the dual-channel SPLINE. The achievable contrast of the SPLINE is limited by residual speckles caused by surface roughness of optical elements. For improving the achievable contrast, we propose a method of wavefront correction using a liquid-crystal spatial light modulator (LCSLM). We have carried out preliminary laboratory demonstration using a liquid-crystal variable retarder (LCVR), instead of the LCSLM, for simulating the proposed wavefront correction method. We report the laboratory demonstration in this paper.

Paper Details

Date Published: 18 July 2014
PDF: 7 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91515N (18 July 2014); doi: 10.1117/12.2055287
Show Author Affiliations
Hirofumi Kitou, Hokkaido Univ. (Japan)
Naoshi Murakami, Hokkaido Univ. (Japan)
Manabu Kida, Hokkaido Univ. (Japan)
Naoshi Baba, Hokkaido Univ. (Japan)
Taro Matsuo, Kyoto Univ. (Japan)
Takayuki Kotani, National Astronomical Observatory of Japan (Japan)
Hajime Kawahara, The Univ. of Tokyo (Japan)
Motohide Tamura, The Univ. of Tokyo (Japan)
National Astronomical Observatory of Japan (Japan)

Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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