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Development of a cryogenic far-infrared grating spectrometer for a post-dispersed fourier transform spectrometer

Anderson, Alicia, Naylor, David, Huber, Anthony, Gom, Brad, Fulton, Trevor, Gunuganti, Sudhakar, Jellema, Willem, Veenendaal, Ian and Ade, Peter 2021. Development of a cryogenic far-infrared grating spectrometer for a post-dispersed fourier transform spectrometer. Presented at: 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Buffalo, USA, 8-13 November 2020. 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE, pp. 1-2. 10.1109/IRMMW-THz46771.2020.9370473

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Abstract

Recent advances in far-infrared detector technology have led to increases in raw sensitivity of more than an order of magnitude over previous state-of-the-art detectors. With such sensitivity, photon noise becomes the dominant noise component, even when using cryogenically cooled optics, unless a method of restricting the spectral bandpass is employed. One method is to use a low-resolution diffraction grating spectrometer to post-disperse the signal from a high-resolution instrument, such as a Fourier transform spectrometer (FTS). This concept has been adopted for the SAFARI instrument on the SPICA mission. This paper discusses the development of a prototype cryogenic grating spectrometer that has been used to evaluate the concept of a post-dispersed polarizing FTS over the range from 285-500 μm.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: IEEE
ISBN: 9781728166209
ISSN: 2162-2035
Date of First Compliant Deposit: 15 April 2021
Date of Acceptance: 11 March 2021
Last Modified: 16 Apr 2021 14:15
URI: http://orca.cf.ac.uk/id/eprint/140505

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