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Beam combiner for the Asgard/BIFROST instrument

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arxiv 2208.04968 v1 pith:EKXNZZPK submitted 2022-08-09 astro-ph.IM

Daniel J. Mortimer , Sorabh Chhabra , Stefan Kraus , Narsireddy Anugu , Romain Laugier , Jean-Baptiste Le Bouquin , John D. Monnier This is my paper · ORCID
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keywords beambifrostcombinerasgardhighlambdaresolutionscheme
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abstract

BIFROST will be a short-wavelength ($\lambda$ = 1.0 - 1.7$\mu$m) beam combiner for the VLT Interferometer, combining both high spatial ($\lambda$/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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