Development of a cryogenic far-infrared post-dispersed polarizing Fourier transform spectrometer: a demonstrator for the SPICA SAFARI instrument

David Naylor; Brad Gom; Anthony Huber; Alicia Anderson; Adam Christiansen; Willem Jellema; Bram Lap; Ian Veenendaal; Alain Cournoyer; Frederic Grandmont; Trevor Fulton; Sudhakar Gunuganti; Peter Ade

doi:10.1117/12.2561100

13 December 2020 Development of a cryogenic far-infrared post-dispersed polarizing Fourier transform spectrometer: a demonstrator for the SPICA SAFARI instrument

David Naylor, Brad Gom, Anthony Huber, Alicia Anderson, Adam Christiansen, Willem Jellema, Bram Lap, Ian Veenendaal, Alain Cournoyer, Frederic Grandmont, Trevor Fulton, Sudhakar Gunuganti, Peter Ade

Author Affiliations +

Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 114530K (2020) https://doi.org/10.1117/12.2561100
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The continued improvement in the sensitivity of superconducting far-infrared bolometers necessitates improved designs of cryogenically cooled broadband spectrometers in order to fully exploit the potential of such detectors. While Fourier transform spectrometers (FTS) have an illustrious history in astronomical research, the sensitivity of state-of-the-art detectors is such that the multiplex disadvantage of FTS is prohibitive unless the spectral bandpass can be restricted to less than 1%. One method of achieving this goal, and the one that has been adopted for the SPICA SAFARI instrument, is to use a diffraction grating as the post-dispersing component. Unlike a typical FTS, in which a single detector simultaneously measures a broad spectral band, a post-dispersed detection system requires multiple detectors, each with their own unique spectral, spatial, and temporal responses. Moreover, the narrow spectral band viewed by each detector results in an interferogram having a large coherence length; the signal is heavily modulated, yet truncated. While simulations play a useful role in modeling instrumental performance, there is no substitute for data obtained from a real implementation of an instrument concept. In this paper we describe the development and current status of a cryogenic, far-infrared, postdispersed, polarizing FTS (PDPFTS): a demonstrator for the SPICA SAFARI instrument.

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David Naylor, Brad Gom, Anthony Huber, Alicia Anderson, Adam Christiansen, Willem Jellema, Bram Lap, Ian Veenendaal, Alain Cournoyer, Frederic Grandmont, Trevor Fulton, Sudhakar Gunuganti, and Peter Ade "Development of a cryogenic far-infrared post-dispersed polarizing Fourier transform spectrometer: a demonstrator for the SPICA SAFARI instrument", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 114530K (13 December 2020); https://doi.org/10.1117/12.2561100

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