Chaotic behavior of quantum cascade lasers at ignition

The ignition of Quantum Cascade Lasers can occur from a state of oscillating field domains. Here, the interplay between lasing and the kinetics of traveling domain boundaries provides complex oscillation scenarios. We analyze our numerical findings in detail for a device operating at terahertz frequencies and manifest chaotic evolution by positive Lyapunov exponents. This shows that these important devices can exhibit chaotic behavior even without periodic driving, which needs to be taken into account in their design. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

Automated summary

The ignition of Quantum Cascade Lasers can occur from a state of oscillating field domains, leading to complex oscillation scenarios. Analysis of numerical findings for devices operating at terahertz frequencies show they can exhibit chaotic behavior with positive Lyapunov exponents even without periodic driving. This highlights the importance of considering chaotic evolution in the design of these devices.