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It has been shown that ring quantum cascade lasers can emit solitons when the driving current is large enough such that spontaneous symmetry breaking occurs between the clockwise and counter-clockwise modes . We show that ring devices with very low backscattering will emit an optical frequency comb when injected with RF close to the round trip frequency. This result is interpreted as a new form of active mode-locking with a fast saturable gain. The transient behavior of the device is studied by time resolved spectroscopy.
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Faist et al. (2024) studied this question.
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