Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 33: Laser Development: Semiconductor Lasers / Nonlinear Effects II

Q 33.3: Vortrag

Mittwoch, 10. März 2010, 14:30–14:45, F 128

Investigations on wave chaos phenomena in VCSELs — •Andreas Molitor¹, Matthias Breuer¹, Pierluigi Debernardi², and Wolfgang Elsäßer¹ — ¹Institute of Applied Physics, Damstadt University of Technology, Schloßgartenstr 7, 64289 Darmstadt, Germany — ²IEIIT-CNR c/o Politecnico di Torino, Corsa Duca degli Abruzzi 24, 10129 Torino, Italy

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-circularly shaped apertures, respectively. These first results are complemented by investigations on surface grating relief VCSELs where the emission and in particular the polarization can be controlled technologically [2].

[1] T.Gensty et al., PRL 94, 233901 1-4 (2005)

[2] J. M. Ostermann et al., Opt. Commun. 246, 511 (2005)