Large Petermann factor in chaotic cavities with many scattering channels.

@article{Frahm2000LargePF,
  title={Large Petermann factor in chaotic cavities with many scattering channels.},
  author={Klaus M. Frahm and Henning Schomerus and Michael Patra and C. W. J. Beenakker},
  journal={EPL},
  year={2000},
  volume={49},
  pages={48-54}
}
The quantum-limited linewidth of a laser cavity is enhanced above the Schawlow-Townes value by the Petermann factor K, due to the non-orthogonality of the cavity modes. The average Petermann factor K in an ensemble of cavities with chaotic scattering and broken time-reversal symmetry is calculated non-perturbatively using random-matrix theory and the supersymmetry technique, as a function of the decay rate Γ of the lasing mode and the number of scattering channels N. We find for N >> 1 that for… Expand

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