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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