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arXiv · 2107.02138

Correcting photodetector nonlinearity in dual-comb interferometry

Philippe Guay·Nicolas Bourbeau Hébert·Alex Tourigny-Plante·Vincent Michaud-Belleau·Jérôme Genest
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Abstract

Photodetector nonlinearity, the main limiting factor in terms of optical power in the detection chain, is corrected to improve the signal-to-noise ratio of a short-time measurement in dual-comb spectroscopy. An iterative correction algorithm minimizing out-of-band spectral artifacts based on nonlinearity correction methods used in classical Fourier-transform spectrometers is presented. The exactitude of the nonlinearity correction is validated using a low power linear measurement. Spectroscopic lines of H$^{12}$CN are provided and the error caused by the saturation of the detector is corrected yielding residuals limited by the measurement noise.

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Philippe Guay, Nicolas Bourbeau Hébert, Alex Tourigny-Plante, Vincent Michaud-Belleau, Jérôme Genest. 2021-07-05. Correcting photodetector nonlinearity in dual-comb interferometry. https://doi.org/10.1364/oe.435701

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