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Proceedings Paper

Wavefront correction inside unbalanced nulling interferometer
Author(s): Masaaki Horie; Jun Nishikawa; Masahito Oya; Naoshi Murakami; Lyu Abe; Ryo Waki; Shiomi Kumagai; Motohide Tamura; Takashi Kurokawa; Hiroshi Murakami
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Paper Abstract

In an unbalanced nulling interferometer (UNI) of our coronagraph system, the incidence light is divided into two, and they interfere by a reverse phase with different amplitude. Thereby, phase errors are magnified and we can correct a wavefront with higher precision. But phase errors of the incident wave will be magnified together with the wavefront errors inside UNI. Now, I am developing a control algorithm of the adaptive optics which removes the wavefront errors inside the interferometer by operating the phase of the light to a suitable value before dividing. In a simulation, wavefront accuracy improved by about 3 times with this technique, and also a comparable effect was acquired experimentally.

Paper Details

Date Published: 12 September 2012
PDF: 6 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452E (12 September 2012);
Show Author Affiliations
Masaaki Horie, Nihon Univ. (Japan)
National Astronomical Observatory of Japan (Japan)
Jun Nishikawa, National Astronomical Observatory of Japan (Japan)
Masahito Oya, Nihon Univ. (Japan)
National Astronomical Observatory of Japan (Japan)
Naoshi Murakami, Hokkaido Univ. (Japan)
Lyu Abe, Univ. Nice Sophia Antipolis (France)
Ryo Waki, Housei Univ. (Japan)
Shiomi Kumagai, Nihon Univ. (Japan)
Motohide Tamura, National Astronomical Observatory of Japan (Japan)
Takashi Kurokawa, Tokyo Univ. of Agriculture and Technology (Japan)
Hiroshi Murakami, Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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