Development and validation of a cryogenic far-infrared diffraction grating spectrometer used to post-disperse the output from a Fourier transform spectrometer

Anderson, Alicia M., Naylor, David A., Gom, Brad G., Buchan, Matthew A., Christiansen, Adam J. and Veenendaal, Ian T. 2024. Development and validation of a cryogenic far-infrared diffraction grating spectrometer used to post-disperse the output from a Fourier transform spectrometer. Review of Scientific Instruments 95 (1) , 015116. 10.1063/5.0177603

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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. The leading instrument concept features reflecting diffraction gratings, which post-disperse the light that has been modulated by a polarizing Fourier transform spectrometer (FTS) onto a detector array, thereby reducing the photon noise on each detector. This paper discusses the development of a cryogenic (4 K) diffraction grating spectrometer that operates over the wavelength range of 285 to 500 μm and was used to post-disperse the output from a room-temperature polarizing FTS. Measurements of the grating spectral response and diffraction efficiency are presented as a function of both wavelength and polarization to characterize the instrumental performance.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Institute of Physics
ISSN:	0034-6748
Date of First Compliant Deposit:	21 March 2024
Date of Acceptance:	1 January 2024
Last Modified:	26 Mar 2024 10:00
URI:	https://orca.cardiff.ac.uk/id/eprint/167408

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