20 July 2016 An ultra-broadband optical system for ALMA Band 2+3
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Abstract
ALMA is the largest radio astronomical facility in the world providing high sensitivity between 35 and 950 GHz, divided in 10 bands with fractional bandwidths between 19 and 36%. Having a lifespan of at least 30 years, ALMA carries out a permanent upgrading plan which, for the receivers, is focused on achieving better sensitivity and larger bandwidths. As result, an international consortium works on demonstrating a prototype receiver covering currents Bands 2 and 3 (67 to 116 GHz) which corresponds to a fractional bandwidth of 54%. Here we present the preliminary design, implementation and characterization of suitable refractive optics. Results indicate an excellent performance in good agreement with simulations.
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V. Tapia, R. Nesti, A. González, I. Barrueto, F. P. Mena, N. Reyes, F. Villa, F. Cuttaia, P. Yagoubov, "An ultra-broadband optical system for ALMA Band 2+3", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99142X (20 July 2016); doi: 10.1117/12.2233143; https://doi.org/10.1117/12.2233143
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