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Updated: Aug 8, 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

Near-Full Current Dynamic Range THz Quantum Cascade Laser Frequency Comb.

Yu Ma^1,2, Weijiang Li^1,2, Yuanyuan Li^1,2

¹Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, China.

|February 25, 2023

Summary

This summary is machine-generated.

This study introduces a terahertz quantum cascade laser frequency comb (THz QCL FC) with a novel waveguide. It achieves stable operation, high power, and a wide current range, advancing THz comb technology.

Keywords:

frequency comb high power low threshold current density near-full current dynamic range quantum cascade lasers terahertz

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Last Updated: Aug 8, 2025

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

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Published on: December 18, 2015

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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Area of Science:

Quantum optics
Terahertz technology
Semiconductor lasers

Background:

Quantum cascade lasers (QCLs) are crucial for generating coherent terahertz (THz) radiation.
Developing stable and high-performance THz frequency combs (FCs) is essential for various spectroscopic applications.
Existing THz QCL FCs face challenges with threshold current, power output, and operational stability.

Purpose of the Study:

To propose and demonstrate a novel terahertz quantum cascade laser frequency comb (THz QCL FC).
To optimize the device for low threshold current density, high output power, and a wide current dynamic range.
To achieve stable frequency comb operation without external dispersion compensation.

Main Methods:

Utilized a hybrid bound-to-continuum active region.
Integrated a semi-insulated surface plasmon waveguide.
Optimized gain dispersion and nonlinear susceptibility.
Analyzed intermode beat note maps to confirm stable operation.

Main Results:

Achieved ultra-low threshold current density of 64.4 A·cm⁻².
Obtained a maximum output power of 22 mW at 10 K.
Demonstrated stable frequency comb operation over a current dynamic range exceeding 97%.
Generated a 300 GHz spectral emission centered at 4.6 THz.

Conclusions:

The proposed THz QCL FC with a semi-insulated surface plasmon waveguide offers superior performance characteristics.
The device enables stable frequency comb operation suitable for advanced THz applications.
This work presents a significant advancement in the development of compact and efficient THz frequency comb sources.