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Updated: Jan 11, 2026

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

Terahertz semiconductor laser chaos.

Binbin Liu^1,2, Carlo Silvestri³, Kang Zhou^1,4

¹State Key Laboratory of Materials for Integrated Circuits and Key Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China.

Nature Communications

|November 13, 2025

Summary

This summary is machine-generated.

Researchers created a terahertz (THz) chaos source using a quantum cascade laser (QCL) without external help. This breakthrough enables controllable THz chaos generation for future applications.

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Area of Science:

Physics
Electrical Engineering
Quantum Optics

Background:

Generating terahertz (THz) chaos is difficult due to limited THz light sources.
Quantum cascade lasers (QCLs) are promising for THz applications but chaos generation remains challenging.

Purpose of the Study:

To experimentally demonstrate a THz chaos source.
To investigate the underlying mechanisms of chaos generation in THz QCLs.
To explore potential applications of THz chaos.

Main Methods:

Experimental demonstration of a THz chaos source using a single multimode THz QCL.
Characterization of the chaotic regime using the largest Lyapunov exponent.
Numerical simulations using effective semiconductor Maxwell-Bloch Equations.
Derivation of a reduced model based on coupled complex Ginzburg-Landau equations.

Main Results:

Successful generation of THz chaos from a solitary multimode THz QCL.
Experimental findings validated by numerical simulations.
Chaos generation attributed to defect-mediated turbulence.
Influence of linewidth enhancement factor and group velocity dispersion on chaotic dynamics investigated.

Conclusions:

A novel, perturbation-free THz chaos source based on a THz QCL has been developed.
The study provides insights into the physics of chaos generation in THz QCLs.
Findings facilitate the development of controllable and integrated THz chaos sources for diverse applications.