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.
Highlights
Galactic/Extragalactic ULDB Spectroscopic Terahertz Observatory (GUSTO) is a National Aeronautics and Space Administration (NASA) supported balloon borne astronomical observatory for studying the life-cycle in the interstellar medium and beyond
High spectral resolution spectroscopy is provided by the heterodyne detection technique that is employed for all three frequency bands
In this paper we report the demonstration of such a 4.7 THz phase grating as the locally generated signal (LO) multiplexer with an unprecedented asymmetric profile, which allows for meeting the specific requirement of the 8 beams of GUSTO
Summary
Publication date 2021 Document Version Final published version Published in Optics Express. Citation (APA) Mirzaei, B., Gan, Y., Finkel, M., Groppi, C., Young, A., Walker, C., Hu, Q., & Gao, J. Important note To cite this publication, please use the final published version (if applicable). This work is downloaded from Delft University of Technology.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
