Understanding photodetector nonlinearity in dual-comb interferometry

The impact of photodetector nonlinearity on dual-comb spectrometers is described and compared to that of Michelson-based Fourier transform spectrometers (FTS). The optical sampling occurring in the dual-comb approach, being the key difference with FTS, causes optical aliasing of the nonlinear spectr...

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Bibliographic Details
Published in:arXiv.org 2021-06
Main Authors: Guay, Philippe, Tourigny-Plante, Alex, Michaud-Belleau, Vincent, Nicolas Bourbeau Hébert, Gouin, Ariane, Genest, Jérôme
Format: Article
Language:English
Subjects:
Fourier transform spectrometers
Fourier transforms
Nonlinearity
Photometers
Online Access:Get full text
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Summary:The impact of photodetector nonlinearity on dual-comb spectrometers is described and compared to that of Michelson-based Fourier transform spectrometers (FTS). The optical sampling occurring in the dual-comb approach, being the key difference with FTS, causes optical aliasing of the nonlinear spectral artifacts. Measured linear and nonlinear interferograms are presented to validate the model. Absorption lines of H\(^{13}\)CN are provided to understand the impact of nonlinearity on spectroscopic measurements.
ISSN:2331-8422