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

Alexander V. Tavrov; Yosuke Tanaka; Tatsutoshi Shioda; Takashi Kurokawa; Mitsuo Takeda

doi:10.1117/12.550759

20 October 2004 Achromatic coronagraph based on out-of-plane common-path nulling interferometer

Alexander V. Tavrov, Yosuke Tanaka, Tatsutoshi Shioda, Takashi Kurokawa, Mitsuo Takeda

Proceedings Volume 5491, New Frontiers in Stellar Interferometry; (2004) https://doi.org/10.1117/12.550759
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

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.

Citation Download Citation

Alexander V. Tavrov, Yosuke Tanaka, Tatsutoshi Shioda, Takashi Kurokawa, and Mitsuo Takeda "Achromatic coronagraph based on out-of-plane common-path nulling interferometer", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); https://doi.org/10.1117/12.550759

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