Daniel J. Mortimer,1 Sorabh Chhabra,1 Stefan Kraus,1 Narsireddy Anuguhttps://orcid.org/0000-0002-2208-6541,2 Romain Laugier,3 Jean-Baptiste Le Bouquin,4 John D. Monnier5
1Univ. of Exeter (United Kingdom) 2CHARA Array, Mt. Wilson Observatory (United States) 3KU Leuven (Belgium) 4Institut de Planétologie et d’Astrophysique de Grenoble (France) 5Univ. of Michigan (United States)
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BIFROST will be a short-wavelength (λ = 1.0 - 1.7 μm) beam combiner for the VLT Interferometer, combining both high spatial (λ/2B = 0.8 mas) and spectral (up to R = 25,000) resolution. It will be part of the Asgard Suite of visitor instruments. The new window of high spectral resolution, short wavelength observations brings with it new challenges. Here we outline the instrumental design of BIFROST, highlighting which beam combiner subsystems are required and why. This is followed by a comparison All-In-One (AIO) beam combination scheme and an Integrated Optics (IO) scheme with ABCD modulation both in terms of expected sensitivity and the practical implementation of each system.
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Daniel J. Mortimer, Sorabh Chhabra, Stefan Kraus, Narsireddy Anugu, Romain Laugier, Jean-Baptiste Le Bouquin, John D. Monnier, "Beam combiner for the Asgard/BIFROST instrument," Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 121831U (26 August 2022); https://doi.org/10.1117/12.2629268