24 July 2014 Concept for fiber-based near-infrared interferometry of highest frequency resolution
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We are presenting first experimental results for subsystems of a low-cost near-infrared heterodyne interferometer concept based on commercial 1.55μm fiber-components with relative phase-stabilization between both telescopes, a shot noise limited heterodyne scheme with ambient temperature operated photodiodes, an ultra-coherent fiber laser, and a ROACH-based correlator. After we worked on a first demonstration with two 14” amateur telescopes on Betelgeuse, the concept should be upgradable to connect mid- or large-class telescopes, also given that the employed fiber phase stabilization scheme will enable the operation of long baselines.
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E. A. Michael, F. Besser, R. Prado, L. Pallanca, "Concept for fiber-based near-infrared interferometry of highest frequency resolution", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 914634 (24 July 2014); doi: 10.1117/12.2057203; https://doi.org/10.1117/12.2057203

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