31 August 2005 3D common-path interferometer: achromatic nulling of on-axial light
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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.
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Alexander V. Tavrov, Alexander V. Tavrov, Yukitoshi Otani, Yukitoshi Otani, Takashi Kurokawa, Takashi Kurokawa, Mitsuo Takeda, Mitsuo Takeda, "3D common-path interferometer: achromatic nulling of on-axial light", Proc. SPIE 5905, Techniques and Instrumentation for Detection of Exoplanets II, 59051A (31 August 2005); doi: 10.1117/12.620027; https://doi.org/10.1117/12.620027


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