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Integer-locking condition for stable dual-comb interferometry in situations with fluctuating frequency-comb
Optics Express
|June 11, 2024
Summary
This study introduces an integer-locking technique for dual-comb interferometry, ensuring stable measurements even with fluctuating optical frequency comb (OFC) repetition rates in challenging environments. This method enhances the robustness of dual-comb interferometry for broader applications.
Area of Science:
- * Optics and Photonics
- * Metrology and Measurement Science
Background:
- * Dual-comb interferometry (DCI) is a powerful technique for high-resolution spectroscopy and metrology.
- * Environmental factors can destabilize optical frequency comb (OFC) repetition rates, impacting measurement reproducibility.
- * Achieving stable DCI in non-ideal conditions is crucial for expanding its practical applications.
Purpose of the Study:
- * To investigate the impact of OFC repetition frequency fluctuations on DCI measurements.
- * To develop a phase-locking scheme for robust DCI in non-ideal environments.
- * To demonstrate the effectiveness of the proposed method in absolute path-length measurements.
Main Methods:
- * Employed a dual-comb interferometry setup with fully referenced OFCs.
- * Analyzed the effect of repetition frequency variations on the interferogram's center burst peak position.
- * Implemented and evaluated a novel phase-locking scheme termed the "integer-locking condition".
Main Results:
- * Identified the integer-locking condition as a method to minimize the impact of repetition-rate fluctuations.
- * Demonstrated that under integer-locking, the number of sampling points per interferogram remains constant despite frequency variations.
- * Achieved stable phase-resolved measurements and accurate absolute path-length measurements in simulated non-ideal environments.
Conclusions:
- * The integer-locking condition provides a strategy for robust dual-comb interferometry outside of controlled metrology laboratories.
- * This approach enhances the stability and reproducibility of DCI measurements in the presence of environmental disturbances.
- * Findings pave the way for wider adoption of DCI in diverse scientific and industrial fields.
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