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Proceedings Paper

Quantum dot microlasers with external feedback: a chaotic system close to the quantum limit
Author(s): Ferdinand Albert; Caspar Hopfmann; Christian Schneider; Sven Höfling; Lukas Worschech; Martin Kamp; Wolfgang Kinzel; Alfred Forchel; Stephan Reitzenstein; Ido Kanter
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Paper Abstract

Studying cavity quantum electrodynamical effects is an emerging and important field of research for the understanding of the many body quantum theory as well as for the generation of a new type of efficient lasers. Here we report a dramatic change in the photon statistics of quantum dot based micropillar lasers where a finite fraction of the emission is reflected back into the microcavity after a roundtrip time τ in an external cavity, where τ greatly exceeds the coherence time. Photon bunching was observed above the threshold current where the second order autocorrelation function g(2)(τ) at zero-lag can reach values up to 3.51±0.06. The change in the photon statistics of the two non-degenerated fundamental modes were found to be correlated, indicating non-trivial interactions between both cavity modes. Furthermore the optical feedback led to revivals of the bunching signal in integer multiples of the round trip time of the external cavity and to a decrease in the coherence time of the laser. These phenomena compare well with milliwatt chaotic lasers induced by an external feedback, indicating that chaos might occur in the nanowatt lasing regime where fluctuations in the photon statistics are in the leading order.

Paper Details

Date Published: 15 May 2012
PDF: 9 pages
Proc. SPIE 8432, Semiconductor Lasers and Laser Dynamics V, 84320G (15 May 2012); doi: 10.1117/12.921783
Show Author Affiliations
Ferdinand Albert, Julius-Maximilians-Univ. Würzburg (Germany)
Caspar Hopfmann, Julius-Maximilians-Univ. Würzburg (Germany)
Christian Schneider, Julius-Maximilians-Univ. Würzburg (Germany)
Sven Höfling, Julius-Maximilians-Univ. Würzburg (Germany)
Lukas Worschech, Julius-Maximilians-Univ. Würzburg (Germany)
Martin Kamp, Julius-Maximilians-Univ. Würzburg (Germany)
Wolfgang Kinzel, Julius-Maximilians-Univ. Würzburg (Germany)
Alfred Forchel, Julius-Maximilians-Univ. Würzburg (Germany)
Stephan Reitzenstein, Julius-Maximilians-Univ. Würzburg (Germany)
Ido Kanter, Bar-Ilan Univ. (Israel)

Published in SPIE Proceedings Vol. 8432:
Semiconductor Lasers and Laser Dynamics V
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)

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