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Tunable dual optical frequency comb at 2 μm for CO2 sensing
Optics Express
|February 24, 2023
Summary
This study presents a dual frequency comb (DFC) for high-resolution spectroscopy. The DFC system enables rapid detection of carbon dioxide (CO2) with millisecond acquisition times.
Area of Science:
- Optics and Photonics
- Spectroscopy
- Laser Technology
Background:
- Optical frequency combs (OFCs) are crucial for high-precision measurements.
- Semiconductor lasers offer compact and tunable light sources.
- Dual frequency combs (DFCs) enhance measurement capabilities through down-conversion.
Purpose of the Study:
- To demonstrate a novel dual frequency comb (DFC) system.
- To achieve tunable free spectral range (FSR) operation in the 2 μm region.
- To showcase the application of DFCs for gas sensing, specifically CO2 detection.
Main Methods:
- Utilizing gain-switching of mutually injection-locked semiconductor lasers.
- Implementing a DFC architecture for optical frequency comb generation.
- Employing a down-conversion process to capture beating spectra within a 15 MHz electrical bandwidth.
Main Results:
- A DFC was successfully demonstrated with a tunable FSR from 500 MHz to 3 GHz.
- High-resolution spectra were acquired with millisecond acquisition times.
- The first experimental demonstration of CO2 sensing using this DFC architecture was achieved.
Conclusions:
- The developed DFC system provides a powerful tool for high-resolution spectroscopy.
- The system's rapid acquisition capabilities are suitable for dynamic sensing applications.
- This DFC approach shows significant potential for sensitive and efficient CO2 detection.
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