12 September 2012 A low-cost fiber-based near-infrared heterodyne interferometer
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We are presenting a low-cost near-infrared heterodyne interferometer based on 1.55ìm fiber-components, amateur telescopes and a 3-GSPS-ROACH-based correlator. While first performance is estimated to be sufficient for the brightest stars, we expect science-relevant astronomical performance given various improvements we are working on, as stabilization of fiber coupling, detectors near the quantum limit requiring lowest possible local oscillator power, and fiber line-length correction. These will enable the investigation of extremely long baselines, adaption of existing medium-class telescopes, and testing at the pointing-telescope slots of ALMA, and/or the extension to three of more baselines.
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Laurent Pallanca, Cristobal Vio, and Ernest A. Michael "A low-cost fiber-based near-infrared heterodyne interferometer", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452Q (12 September 2012); doi: 10.1117/12.927433; https://doi.org/10.1117/12.927433

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