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Correcting photodetector nonlinearity in dual-comb interferometry.

Philippe Guay, Nicolas Bourbeau Hébert, Alex Tourigny-Plante

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    |October 7, 2021
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    Summary
    This summary is machine-generated.

    Photodetector nonlinearity in dual-comb spectroscopy was corrected using an iterative algorithm. This improved the signal-to-noise ratio for short-time measurements, accurately correcting detector saturation effects.

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    Area of Science:

    • Spectroscopy
    • Optical Engineering
    • Signal Processing

    Background:

    • Photodetector nonlinearity limits optical power detection.
    • This nonlinearity impacts signal-to-noise ratio in measurements.
    • Accurate spectral analysis requires addressing detector limitations.

    Purpose of the Study:

    • To correct photodetector nonlinearity in dual-comb spectroscopy.
    • To improve signal-to-noise ratio for short-time measurements.
    • To validate the correction method using spectroscopic data.

    Main Methods:

    • Developed an iterative correction algorithm.
    • Algorithm minimizes out-of-band spectral artifacts.
    • Validated correction using low-power linear measurements and H12CN spectra.

    Main Results:

    • Successfully corrected photodetector nonlinearity.
    • Achieved improved signal-to-noise ratio in short-time measurements.
    • Corrected a 24% increase in absorption depth due to detector saturation.

    Conclusions:

    • The iterative algorithm effectively corrects photodetector nonlinearity.
    • This correction enhances accuracy in dual-comb spectroscopy.
    • Residuals are limited by measurement noise after correction.