Journal
OPTICS EXPRESS
Volume 23, Issue 2, Pages 1651-1669Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.001651
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Frequency comb formation in quantum cascade lasers is studied theoretically using a Maxwell-Bloch formalism based on a modal decomposition, where dispersion is considered. In the mid-infrared, comb formation persists in the presence of weak cavity dispersion (500 fs(2) mm(-1)) but disappears when much larger values are used (30'000 fs(2) mm(-1)). Active modulation at the round-trip frequency is found to induce mode-locking in THz devices, where the upper state lifetime is in the tens of picoseconds. Our results show that mode-locking based on four-wave mixing in broadband gain, low dispersion cavities is the most promising way of achieving broadband quantum cascade laser frequency combs. (C) 2015 Optical Society of America
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