Determining the efficiency of a cryogenic far-infrared diffraction grating spectrometer used as a post-dispersing module for a high-resolution spectrometer

Alicia M. Anderson; David A. Naylor; Brad G. Gom; Ian T. Veenendaal; Adam J. Christiansen; Willem Jellema; Peter A. R. Ade

doi:10.1117/12.2628259

31 August 2022 Determining the efficiency of a cryogenic far-infrared diffraction grating spectrometer used as a post-dispersing module for a high-resolution spectrometer

Alicia M. Anderson, David A. Naylor, Brad G. Gom, Ian T. Veenendaal, Adam J. Christiansen, Willem Jellema, Peter A. R. Ade

Author Affiliations +

Proceedings Volume 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; 121902C (2022) https://doi.org/10.1117/12.2628259
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

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 grating spectrometers to 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 describes the development of a cryogenic (4 K) reflection grating spectrometer which operates over the wavelength range from 285 µm–500 µm and was used to post-disperse the output from a room-temperature polarizing FTS. Measurements of the grating resolving power and diffraction efficiency are presented as a function of both wavelength and polarization to characterize the instrument performance

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Alicia M. Anderson, David A. Naylor, Brad G. Gom, Ian T. Veenendaal, Adam J. Christiansen, Willem Jellema, and Peter A. R. Ade "Determining the efficiency of a cryogenic far-infrared diffraction grating spectrometer used as a post-dispersing module for a high-resolution spectrometer", Proc. SPIE 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 121902C (31 August 2022); https://doi.org/10.1117/12.2628259

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