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Proceedings Paper

Nulling stellar coronagraph using liquid-crystal device
Author(s): Naoshi Murakami; Naoshi Baba; Tsuyoshi Ishigaki; Nobuyuki Hashimoto
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Paper Abstract

Nulling stellar coronagraph has been proposed to detect faint objects very close to a bright point-like star, especially extra-solar planets. The principle of the nulling stellar coronagraph is to cause destructive interference for the light from a star. There have been proposed several methods for nulling interferometry. The key point of the nulling interferometry is the way to produce π-phase shift over wide range of wavelength. Here we propose a method for realizing achromatic π-phase shift utilizing polarization interference. The phase difference between two light beams that pass through different polarizers is π radians when these polarizers are placed between mutually orthogonal polarizer and analyzer. We adopt a ferroelectric liquid-crystal (FLC) device to convert the polarization direction of the incident beam. The FLC device is regarded as a birefringent device with retardation π, namely a half wave plate. The FLC device forms four-quadrant structure and is placed between the polarizer and the analyzer. By fixing the optic axes of the four-quadrant FLC suitably, it can rotate the incident linearly polarized light in parts by plus/minus 45°.

Paper Details

Date Published: 3 March 2003
PDF: 8 pages
Proc. SPIE 4860, High-Contrast Imaging for Exo-Planet Detection, (3 March 2003); doi: 10.1117/12.457651
Show Author Affiliations
Naoshi Murakami, Hokkaido Univ. (Japan)
Naoshi Baba, Hokkaido Univ. (Japan)
Tsuyoshi Ishigaki, Hokkaido Univ. (Japan)
Nobuyuki Hashimoto, Citizen Watch Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 4860:
High-Contrast Imaging for Exo-Planet Detection
Alfred B. Schultz; Richard G. Lyon, Editor(s)

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