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Dedicated spectrometers for terahertz radiation with [0.3, 30] THzfrequencies using traditional optomechanical interferometry are substantiallyless common than their infrared and microwave counterparts. This paper presentsthe design and initial performance measurements of a tabletop Fourier transformspectrometer (FTS) for multi-terahertz radiation using infrared optics in aMichelson arrangement. This is coupled to a broadband pyroelectricphotodetector designed for [0.1, 30] THz frequencies. We measure spectra ofnarrowband and broadband input radiation to characterize the performance ofthis instrument above 10 THz, where signal-to-noise is high. This paves thegroundwork for planned upgrades to extend below 10 THz. We also briefly discusspotential astroparticle physics applications of such FTS instruments tobroadband axion dark matter searches, whose signature comprises low-ratemonochromatic photons with unknown frequency.

Design and performance of a multi-terahertz Fourier transform spectrometer for axion dark matter experiments