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Linear dual-comb interferometry at high power levels.

Philippe Guay, Mathieu Walsh, Alex Tourigny-Plante

|February 14, 2023

Summary

This summary is machine-generated.

Handling photodetector non-linearity in dual-comb interferometry allows for higher input power and improved signal-to-noise ratio (SNR). This study demonstrates linear dual-comb interferograms even with high power, reducing spectral artifacts.

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Area of Science:

Spectroscopy
Optical Metrology
Quantum Optics

Background:

Detector non-linearity limits signal-to-noise ratio (SNR) in dual-comb interferometry.
High input power is crucial for enhancing SNR without extensive averaging.
Proper management of photodetector impulse response is key to mitigating non-linearity effects.

Purpose of the Study:

To investigate and demonstrate methods for handling photodetector non-linearity in dual-comb interferometry.
To achieve higher signal-to-noise ratios at high input power levels.
To characterize detector performance under high intensity conditions.

Main Methods:

Characterization of a high bandwidth non-amplified balanced photodetector's impulse response.
Utilizing high intensity short pulses to test detector behavior.
Measuring absorption lines of carbon dioxide for accuracy validation.

Main Results:

Nonlinear spectral artifacts were suppressed by at least 40 dB below the spectral baseline with 23.5 mW average power per detector.
Measured carbon dioxide absorption lines showed discrepancies smaller than 0.1% compared to HITRAN database.
A spectral shape independent dual-comb figure of merit reached 7.2 × 10⁷ Hz^1/2.

Conclusions:

Effective handling of detector non-linearity enables linear dual-comb interferograms at high optical power.
The demonstrated method significantly improves SNR and accuracy in dual-comb spectroscopy.
This work paves the way for more robust and sensitive dual-comb interferometry systems.