We report the observation of a coherent multimode instability in quantum cascade lasers QCLs, which is
driven by the same fundamental mechanism of Rabi oscillations as the elusive Risken-Nummedal-Graham-
Haken RNGH instability predicted 40 years ago for ring lasers. The threshold of the observed instability is
significantly lower than in the original RNGH instability, which we attribute to saturable-absorption nonlinearity
in the laser. Coherent effects, which cannot be reproduced by standard laser rate equations, can play
therefore a key role in the multimode dynamics of QCLs, and in lasers with fast gain recovery in general.
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We report the observation of a coherent multimode instability in quantum cascade lasers QCLs, which is
driven by the same fundamental mechanism of Rabi oscillations as the elusive Risken-Nummedal-Graham-
Haken RNGH instability predicted 40 years ago for ring lasers. The threshold of the observed instability is
significantly lower than in the original RNGH instability, which we attribute to saturable-absorption nonlinearity
in the laser. Coherent effects, which cannot be reproduced by standar...
»