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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. Europhysics Letters, 49. p. 48.

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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: Article
    Journal or Publication Title: Europhysics Letters
    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: 26 Jul 2012 18:19
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/696

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