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Mirzaei, B. (author), Gan, Y. (author), Finkel, M. (author), Groppi, Christopher (author), Young, Abram (author), Walker, Christopher (author), Hu, Qing (author), Gao, J.R. (author)A full demonstration of the Fourier phase grating used as 4.7 THz local oscillator (LO) multiplexer for Galactic/Extragalactic ULDB Spectroscopic Terahertz Observatory (GUSTO) is presented in this paper, including its design, modeling, tolerance analysis, and experimental characterizations of the angular and intensity distributions among 2 ×...journal article 2021