F. Grillot, T. C. Newell, A. Gavrielides, M. Carras,
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10383/103830D/Complex-delay-dynamics-of-high-power-quantum-cascade-oscillators/10.1117/12.2275630.short
Quantum cascade lasers (QCL) have become the most suitable laser sources from the mid-infrared to the THz range. This work examines the effects of external feedback in different high power mid infrared QCL structures and shows that different conditions of the feedback wave can produce complex dynamics hence stabilization, destabilization into strong mode-competition or undamping nonlinear oscillations. As a dynamical system, reinjection of light back into the cavity also can also provoke apparition of chaotic oscillations, which must be avoided for a stable operation both at mid-infrared and THz wavelengths.
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