4.7 THz asymmetric beam multiplexer for GUSTO

Journal article (2021)

Authors

B. Mirzaei SRON–Netherlands Institute for Space Research, ImPhys/Optics - AS
Y. Gan SRON–Netherlands Institute for Space Research, Rijksuniversiteit Groningen
M. Finkel SRON–Netherlands Institute for Space Research
C. Groppi Arizona State University
Abram Young University of Arizona
Christopher Walker University of Arizona
Qing Hu Massachusetts Institute of Technology
J.R. Gao SRON–Netherlands Institute for Space Research, ImPhys/Optics - AS
Research Group
ImPhys/Optics (AS) (TU Delft)
Copyright: © 2021 B. Mirzaei, Y. Gan, M. Finkel, Christopher Groppi, Abram Young, Christopher Walker, Qing Hu, J.R. Gao
DOI: https://doi.org/10.1364/OE.432088
More Info
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Published Date

2021

Language

English

Faculty

Applied Sciences

Department

ImPhys/Imaging Physics

Research Group

ImPhys/Optics

Abstract

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 × 4 output beams and the power efficiency. A quantum cascade laser (QCL) is used to generate the input beam for evaluation of the grating performance in its all relevant aspects with an accuracy level never reported before, where good agreements with modeling results are found. This is the first asymmetric-profile grating fully modelled and characterized at a THz frequency, that further confirms the versatility of this technology for providing an intermediate optical element for feeding multiple array detectors with a single radiation source at such a scientifically interesting frequency regime.