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An Investigation of All Fiber Free-Running Dual-Comb Spectroscopy
Fu Yang1, Yanyu Lu1, Guibin Liu1
1College of Science, Donghua University, Shanghai 201620, China.
Sensors (Basel, Switzerland)
|February 11, 2023
Summary
This study presents a software algorithm to maintain mutual coherence in dual-comb spectroscopy (DCS) systems. The method enables precise spectral measurements using fiber combs without complex phase-locking, proving its practical application.
Area of Science:
- Spectroscopy
- Optical Physics
- Metrology
Background:
- Dual-comb spectroscopy (DCS) offers high precision spectral measurements by utilizing two phase-locked optical frequency combs.
- Maintaining mutual coherence between these combs is critical for accurate DCS applications.
- Existing DCS systems often require complex and costly phase-locking equipment.
Purpose of the Study:
- To develop and validate a software algorithm for achieving mutual coherence in DCS systems.
- To demonstrate the feasibility of a low-cost, fiber-connected DCS system.
- To enable simultaneous absorption spectra measurement of multiple species.
Main Methods:
- Utilized a pair of free-running large anomalous dispersion fiber combs operating around 1064 nm.
- Employed asynchronous optical sampling to transfer optical frequency domain characteristics to the radio frequency domain.
- Simulated spectral data using fiber Bragg gratings (FBGs) and verified the algorithm through simulation and a principal experiment.
Main Results:
- Successfully obtained absorption spectra of multiple species with a signal-to-noise ratio (SNR) of 13.97 dB within a 100 ms sampling time.
- The developed software algorithm effectively maintained mutual coherence between the two optical frequency combs.
- The system operated using optical fiber connections without additional phase-locking equipment.
Conclusions:
- The software algorithm is a feasible and effective solution for maintaining mutual coherence in DCS systems.
- The demonstrated fiber-connected DCS system offers a low-cost and practical alternative for spectral measurements.
- This approach shows significant potential for widespread adoption in various scientific and industrial applications.
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