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Proceedings Paper

Achromatic coronagraph based on out-of-plane common-path nulling interferometer
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Paper Abstract

3D common-path interferometer is proposed to obtain achromatic nulling for star coronagraphy. Common-path scheme compensates optical path difference (OPD) effectively and is stable to mechanical vibrations. 3D ray geometry involves polarization rotations ±90° in each interferometer arm and results in achromatic 180° phase shift for destructive interference for on-axial source. The interferometer throughput is obtained at nearly 100% for entire polarized light and nearly 50/50 ratio of light energy is split between Bright and Nulled ports for off-axial source. Theory, simulations and preliminary breadboard experiments are shown in reasonable agreement.

Paper Details

Date Published: 20 October 2004
PDF: 7 pages
Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); doi: 10.1117/12.550759
Show Author Affiliations
Alexander V. Tavrov, Tokyo Univ. of Agriculture and Technology (Japan)
Yosuke Tanaka, Tokyo Univ. of Agriculture and Technology (Japan)
Tatsutoshi Shioda, Tokyo Univ. of Agriculture and Technology (Japan)
Takashi Kurokawa, Tokyo Univ. of Agriculture and Technology (Japan)
Mitsuo Takeda, Univ. of Electro-Communications (Japan)


Published in SPIE Proceedings Vol. 5491:
New Frontiers in Stellar Interferometry
Wesley A. Traub, Editor(s)

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