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Simulation and calibration of a compact millimeter-wavelength Fourier transform spectrometer

Liu, Mira and Pan, Zhaodi and Basu Thakur, Ritoban and Meyer, Stephan S. (2020) Simulation and calibration of a compact millimeter-wavelength Fourier transform spectrometer. Applied Optics, 59 (25). pp. 7726-7733. ISSN 1559-128X.

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This paper presents the simulation and calibration of a Fourier transform spectrometer (FTS) developed to measure the spectrum of radiation sources between 50 GHz and 330 GHz, such as the cosmic microwave background. The recorded signal is modified from the ideal by properties of the interferometer and the detection system. We have developed a ray-trace-based simulation with which we can model these effects. The model can be verified with measurements and used to understand the instrument’s systematic effects and to design new optimized configurations. The optimization comprises parameters of the design, such as large étendu, maximal spectral resolution, compact size, operational simplicity, and light weight, that conflict and need to be balanced. The numerical simulation consists of two parts: time-stream signal analysis and a ray-trace-based simulation that includes polarization and path length calculations and can account for the effects of beam loss and change of focus as the delay-generating mirror travels on its path. The simulation can study the coherence level and frequency resolution of the FTS instrument. While not exercised in this study, the simulation also can be used to study the effect of mirror figure and polarizer non-idealities, walk-off rays in the beam due to the large étendu, as well as misalignment of optical elements. We then present the comparison between simulations of a spectrally unresolved source and measurements by the FTS.

Item Type:Article
Related URLs:
URLURL TypeDescription
Liu, Mira0000-0002-8729-9302
Pan, Zhaodi0000-0002-6164-9861
Basu Thakur, Ritoban0000-0002-3351-3078
Meyer, Stephan S.0000-0003-3315-4332
Additional Information:© 2020 Optical Society of America. Received 23 June 2020; revised 20 July 2020; accepted 22 July 2020; posted 24 July 2020 (Doc. ID 397312); published 1 September 2020. Funding: National Science Foundation (DGE-1746045, PHY-1125897, PLR-1248097); Kavli Foundation; Gordon and Betty Moore Foundation (GBMF 947). The authors declare no conflicts of interest.
Funding AgencyGrant Number
NSF Graduate Research FellowshipDGE-1746045
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore FoundationGBMF 947
Issue or Number:25
Record Number:CaltechAUTHORS:20201012-090727553
Persistent URL:
Official Citation:Mira Liu, Zhaodi Pan, Ritoban Basu Thakur, and Stephan S. Meyer, "Simulation and calibration of a compact millimeter-wavelength Fourier transform spectrometer," Appl. Opt. 59, 7726-7733 (2020)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105978
Deposited By: Tony Diaz
Deposited On:12 Oct 2020 16:14
Last Modified:12 Oct 2020 16:14

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