Compact millimeter-wavelength Fourier-transform spectrometer
- 6 August 2019
- journal article
- research article
- Published by Optica Publishing Group in Applied Optics
- Vol. 58 (23), 6257-6267
- https://doi.org/10.1364/AO.58.006257
Abstract
We have constructed a Fourier-transform spectrometer (FTS) operating between 50 GHz and 330 GHz with minimum volume () and weight (5.9 kg) while maximizing optical throughput () 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.
Keywords
Funding Information
- National Science Foundation (NSF) (PHY-1125897, PLR-1248097)
- Kavli Foundation
- Gordon and Betty Moore Foundation (GBMF 947)
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