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Updated: Mar 6, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

High efficiency quantum cascade laser frequency comb.

Quanyong Lu¹, Donghai Wu¹, Steven Slivken¹

¹Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208, USA.

Scientific Reports

|March 7, 2017

Summary

This summary is machine-generated.

We developed an efficient mid-infrared quantum cascade laser frequency comb with high power and a narrow linewidth. This breakthrough significantly enhances performance for spectroscopy and metrology applications.

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Area of Science:

Quantum Optics
Laser Physics
Mid-Infrared Technology

Background:

Mid-infrared (mid-IR) frequency combs are crucial for high-speed, high-resolution spectroscopy and metrology.
Existing mid-IR sources often lack sufficient power, efficiency, or spectral bandwidth for advanced applications.

Purpose of the Study:

To demonstrate an efficient mid-infrared quantum cascade laser (QCL) frequency comb.
To achieve high power output and a narrow beatnote linewidth at room temperature.
To improve the efficiency and spectral coverage of QCL frequency combs.

Main Methods:

Designed a QCL active region with strong coupling for high quantum efficiency and broadband gain.
Engineered group velocity dispersion for efficient, broadband mode-locking via four-wave mixing.
Fabricated and characterized the mid-IR frequency comb device.

Main Results:

Achieved a narrow intermode beatnote linewidth of 50.5 Hz.
Obtained a maximum wall-plug efficiency of 6.5%, a six-fold improvement over previous work.
Demonstrated spectral coverage of 110 cm⁻¹ at approximately 8 μm.
Operated the device at room temperature with high power output.

Conclusions:

The developed mid-IR QCL frequency comb offers unprecedented efficiency and performance.
This technology significantly advances capabilities in high-precision remote sensing and spectroscopy.
The high power and narrow linewidth pave the way for broader adoption of QCL frequency combs.