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.
|Title of host publication||Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII|
|Editors||Wayne S. Holland, Jonas Zmuidzinas|
|Place of Publication||Bellingham|
|Number of pages||7|
|Publication status||Published - 1 Jul 2016|
|Name||Proceedings of SPIE|
Tapia, V., Nesti, R., González, A., Barrueto, I., Mena, F. P., Reyes, N., Villa, F., Cuttaia, F., & Yagoubov, P. (2016). An ultra-broadband optical system for ALMA Band 2+3. In W. S. Holland, & J. Zmuidzinas (Eds.), Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII [99142X] (Proceedings of SPIE; Vol. 9914). SPIE. https://doi.org/10.1117/12.2233143