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.
Quantum cascade lasers with optical feedback: Regular multimode dynamics / Columbo, Ll.; Brambilla, M.; Mezzapesa, Fp.; Dabbicco, M.; Scamarcio, G.. - STAMPA. - 9370:(2015). (Intervento presentato al convegno Quantum Sensing and Nanophotonic Devices XII tenutosi a San Francisco, CA nel 8.12 Febbraio 2015) [10.1117/12.2084520].
Quantum cascade lasers with optical feedback: Regular multimode dynamics
Brambilla, M.;Dabbicco, M.;
2015-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.