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8 February 2015 Quantum cascade lasers with optical feedback: regular multimode dynamics
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We study the dynamics of a Quantum Cascade Laser subject to strong optical feedback in the framework of the Lang-Kobayashi model. In particular, we demonstrate that the continuous wave instability may lead to coherent multimode oscillations that indicate spontaneous phase-locking among external cavity modes. We recently predicted that this unique behavior is linked to the absence of relaxation oscillations in unipolar semiconductor lasers, which are characterized by a fast carriers recombination time (class-A lasers). These theoretical evidences may help understanding the mechanisms possibly leading to spontaneous mode-locking and pulse generation in QCLs.
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L. L. Columbo, M. Brambilla, F. P. Mezzapesa, Maurizio Dabbicco, and G. Scamarcio "Quantum cascade lasers with optical feedback: regular multimode dynamics", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 937013 (8 February 2015);

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