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Related Experiment Video

Updated: Aug 9, 2025

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Tunable dual optical frequency comb at 2 μm for CO₂ sensing.

E Russell, A A Ruth, B Corbett

|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.

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Last Updated: Aug 9, 2025

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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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.