Large Petermann factor in chaotic cavities with many scattering channels.

Frahm, K. M. and Schomerus, H. and Patra, M. and Beenakker, C. W. J. (2000) Large Petermann factor in chaotic cavities with many scattering channels. EPL, 49. p. 48. ISSN 1286-4854

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Abstract

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 Gamma of the lasing mode and the number of scattering channels N. We find for N>>1 that for typical values of Gamma the average Petermann factor <K> propto N >> 1 is parametrically larger than unity.

Item Type: Journal Article
Journal or Publication Title: EPL
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 696
Deposited By: Dr Henning Schomerus
Deposited On: 31 Oct 2007
Refereed?: Yes
Published?: Published
Last Modified: 22 Aug 2019 00:41
URI: https://eprints.lancs.ac.uk/id/eprint/696

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