Journal
OPTICS EXPRESS
Volume 22, Issue 9, Pages 10105-10118Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.010105
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Funding
- Italian Ministry of Research (MIUR) through the Futuro in Ricerca FIRB-grant PHOCOS [RBFR08E7VA]
- MASSIME
- [MIURPON02-0576 INNOVHEAD]
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We study the instability thresholds of the stationary emission of a quantum cascade laser with optical feedback described by the Lang Kobayashi model. We introduce an exact linear stability analysis and an approximated one for an unipolar lasers, who does not exhibit relaxation oscillations, and investigate the regimes of the emitter beyond the continuous wave instability threshold, depending on the number and density of the external cavity modes. We then show that a unipolar laser with feedback can exhibit coherent multimode oscillations that indicate spontaneous phase-locking. (C) 2014 Optical Society of America
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