Theory of linewidth narrowing in Fano lasers

@article{Yu2022TheoryOL,
  title={Theory of linewidth narrowing in Fano lasers},
  author={Yi Yu and Aref Rasoulzadeh Zali and Jesper M{\o}rk},
  journal={Physical Review Research},
  year={2022}
}
We present a general theory for the coherence of Fano lasers based on a bound state in the continuum. We find that such lasers enable orders of magnitude reduction of the quantum-limited linewidth, and by introducing mirror symmetry breaking, the linewidth can be further reduced, In contrast to ordinary macroscopic lasers, though, the linewidth may re-broaden due to optical nonlinearities enhanced by the strong light localization. This leads to the identification of optimal material systems. We… 
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