Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.56: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Monitoring threshold dynamics by ultrafast direct observation of correlations between individual photon emission events in microcavity lasers — •Marc Aßmann¹, Thorsten Berstermann¹, Manfred Bayer¹, Jan Wiersig^2,5, Christopher Gies², Frank Jahnke², Caroline Kistner³, Stephan Reitzenstein³, Christian Schneider³, Sven Höfling³, Alfred Forchel³, Carsten Kruse⁴, and Detlef Hommel⁴ — ¹Experimentelle Physik II, Technische Universität Dortmund, 44221 Dortmund, Germany — ²Institute for Theoretical Physics, University of Bremen, 28334 Bremen, Germany — ³Technische Physik, University of Würzburg, 97074 Würzburg, Germany — ⁴Institute for Solid State Physics, University of Bremen, 28334 Bremen, Germany — ⁵Institute for Theoretical Physics, University of Magdeburg, 39016 Magdeburg, Germany

The onset of coherent emission in lasers is identified by a change in the photon statistics. In semiconductor lasers the short coherence times below the lasing threshold complicate such measurements as the temporal decay of correlations is considerably faster than the time resolution of usual photodiodes. A novel experimental approach using a streak camera allows us to overcome this problem with a time resolution of 2 ps. This allows for a very detailed characterization of microcavity lasers and enables us to describe the lasing process in detail. Especially around the lasing threshold phenomena like the emission of nonclassical light in few-QD-VCSELs, dynamical antibunching and relaxation oscillations in the second order correlation function are found.