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Proceedings Paper

3D common-path interferometer: achromatic nulling of on-axial light
Author(s): Alexander V. Tavrov; Yukitoshi Otani; Takashi Kurokawa; Mitsuo Takeda
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Paper Abstract

Three-dimensional common-path interferometer is proposed to obtain achromatic nulling for the on-axial source; the off-axial source remains detectable. The 3D interferometer involves ±90o polarization rotations in each interferometer arm. That results in the achromatic 180o phase shift, so that the on-axial source interferes destructively. Depending on the source axial position, the light energy is split by different ratios between the Bright and the Nulled interferometers outputs. For the linearly polarized on-axial source, all the energy at nearly 100% is directed to the Bright port. For the off-axial source, the light is split by the ratio at nearly 50% / 50 % between the Bright and the Nulled ports. The common-path scheme compensates effectively the optical path difference (OPD) and it remains stable to mechanical vibrations. Theory, simulations and preliminary breadboard experiments are shown to be in reasonable agreement.

Paper Details

Date Published: 31 August 2005
PDF: 7 pages
Proc. SPIE 5905, Techniques and Instrumentation for Detection of Exoplanets II, 59051A (31 August 2005); doi: 10.1117/12.620027
Show Author Affiliations
Alexander V. Tavrov, Tokyo Univ. of Agriculture and Technology (Japan)
Yukitoshi Otani, Tokyo Univ. of Agriculture and Technology (Japan)
Takashi Kurokawa, Tokyo Univ. of Agriculture and Technology (Japan)
Mitsuo Takeda, The Univ. of Electro-Communications (Japan)


Published in SPIE Proceedings Vol. 5905:
Techniques and Instrumentation for Detection of Exoplanets II
Daniel R. Coulter, Editor(s)

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