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Authors: Andreas Molitor, Matthias Breuer, Pierluigi Debernardi, Wolfgang Elsäßer
VCSELs are modern low-cost semiconductor laser structures that have become standard lasers in optical datacom applications. The same properties, which make them so interesting for applications, imply also high invulnerability to instabilities or chaos. We experimentally investigate the onset of wave chaos in VCSELs with different shaped resonators [1]. Signatures of chaos are found by analyzing highly-resolved transverse mode spectra measured with a Czerny-Turner-spectrometer and a single photon counting system. The nearest-neighbor eigenvalue distribution is determined from the mode spacing normalized by its mean value. Furthermore, cumulated eigenvalue spacing distributions are derived in order to analyze the optical spectra. This cumulated distribution allows to differentiate between regular behavior for circular and chaotic characteristics for non-circular resonator shapes, respectively. [1] T.Gensty et al., PRL 94, 233901 1-4 (2005) |
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