Correcting spectral baseline fluctuations in dual-comb interferometry

A method to measure and correct for spectral baseline fluctuations in dual-comb interferometry is presented. Fluctuations can be measured from the amplitude of beat notes between combs and a continuous wave laser or from a separate measurement of the combs' repetition rates, filtered around the...

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Bibliographic Details
Published in:Optics letters 2022-01, Vol.47 (2), p.206-209
Main Authors: Walsh, Mathieu, Tourigny-Plante, Alex, Guay, Philippe, Fdil, Khaoula, Genest, Jérôme
Format: Article
Language:English
Subjects:
Amplitudes
Continuous wave lasers
Fourier transforms
Interferometry
Spectra
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Summary:A method to measure and correct for spectral baseline fluctuations in dual-comb interferometry is presented. Fluctuations can be measured from the amplitude of beat notes between combs and a continuous wave laser or from a separate measurement of the combs' repetition rates, filtered around the spectral region of interest. Amplitude-dependent spectral variations are characterized using low-resolution Fourier transforms around the centerburst of several interferograms, and a nonstationary filter is applied to properly account for the combs' variations during the measurement. This allows removal of this source of statistical, as well as systematic, errors.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.442748