24 July 2014 Co-phasing the Large Binocular Telescope: status and performance of LBTI/PHASECam
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Abstract
The Large Binocular Telescope Interferometer is a NASA-funded nulling and imaging instrument designed to coherently combine the two 8.4-m primary mirrors of the LBT for high-sensitivity, high-contrast, and highresolution infrared imaging (1.5-13 μm). PHASECam is LBTI's near-infrared camera used to measure tip-tilt and phase variations between the two AO-corrected apertures and provide high-angular resolution observations. We report on the status of the system and describe its on-sky performance measured during the first semester of 2014. With a spatial resolution equivalent to that of a 22.8-meter telescope and the light-gathering power of single 11.8-meter mirror, the co-phased LBT can be considered to be a forerunner of the next-generation extremely large telescopes (ELT).
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D. Defrère, P. Hinz, E. Downey, D. Ashby, V. Bailey, G. Brusa , J. Christou, W. C. Danchi, P. Grenz, J. M. Hill, W. F. Hoffmann, J. Leisenring, J. Lozi, T. McMahon, B. Mennesson, R. Millan-Gabet, M. Montoya, K. Powell, A. Skemer, V. Vaitheeswaran, A. Vaz, C. Veillet, "Co-phasing the Large Binocular Telescope: status and performance of LBTI/PHASECam", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 914609 (24 July 2014); doi: 10.1117/12.2057178; https://doi.org/10.1117/12.2057178
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