A Compact Millimeter-Wavelength Fourier-Transform Spectrometer

Abstract

We have constructed a Fourier-transform spectrometer (FTS) operating between 50 and 330 GHz with minimum volume (355 x260 x64 mm) and weight (13 lbs) while maximizing optical throughput (100 ${\mathrm{mm}}^2$ sr) and optimizing the spectral resolution (4 GHz). This FTS is designed as a polarizing Martin-Puplett interferometer with unobstructed input and output in which both input polarizations undergo interference. The instrument construction is simple with mirrors milled on the box walls and one motorized stage as the single moving element. We characterize the performance of the FTS, compare the measurements to an optical simulation, and discuss features that relate to details of the FTS design. The simulation is also used to determine the tolerance of optical alignments for the required specifications. We detail the FTS mechanical design and provide the control software as well as the analysis code online.

arXiv commentSubmitted to Applied Optics. [Copyright 2019 Optical Society of America]. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved

References in corpus (4)

• The 10 Meter South Pole Telescope
• The Primordial Inflation Explorer (PIXIE): A Nulling Polarimeter for Cosmic Microwave Background Observations
• Optical Characterization of the SPT-3G Focal Plane
• The Effects of Bandpass Variations on Foreground Removal Forecasts for Future CMB Experiments

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• Design and performance of a multi-terahertz Fourier transform spectrometer for axion dark matter experiments
• High-Efficiency and Low-Noise Detectors for the Upgraded CLASS 90 GHz Focal Plane
• The Design and Integrated Performance of SPT-3G