Computational coherent averaging for free-running dual-comb spectroscopy.

Area of Science:

• Spectroscopy
• Quantum Optics
• Laser Technology

Background:

• Dual-comb spectroscopy offers broadband, high-resolution measurements with microsecond time resolution.
• High mutual coherence between comb sources is crucial for sensitive measurements and extended averaging.
• Existing systems often rely on complex and costly electro-optical components for coherent averaging.

Purpose of the Study:

• To propose an all-computational solution for coherent averaging in dual-comb spectroscopy.
• To develop a method compatible with real-time data acquisition for free-running systems.
• To demonstrate the efficacy of computational phase correction for enhanced spectral analysis.

Main Methods:

• Development of an advanced computational phase correction algorithm.
• Integration of the algorithm with real-time data acquisition architectures.
• Testing across diverse dual-comb spectrometer platforms, including quantum cascade lasers, interband cascade lasers, mode-locked lasers, and microresonators.

Main Results:

• Successful implementation of an all-computational coherent averaging technique.
• Demonstrated compatibility with free-running dual-comb systems.
• Validation of the algorithm's effectiveness across multiple laser technologies.

Conclusions:

• The proposed computational approach simplifies dual-comb spectroscopy by eliminating the need for additional electro-optical components.
• This method enables high-sensitivity measurements and extended averaging times in a cost-effective manner.
• The technique is broadly applicable to various free-running dual-comb spectrometer configurations.