Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 59: Quantum Dots and Wires, Optical Properties V

HL 59.5: Talk

Thursday, March 25, 2010, 17:00–17:15, H14

Polarization and coherence properties of semiconductor micropillar lasers — •Jean-Sebastian Tempel¹, Ilya Akimov¹, Christian Schneider², Sven Höfling², Alfred Forchel², and Manfred Bayer¹ — ¹Experimentelle Physik II, Technische Universität Dortmund, D-44221 Dortmund — ²Technische Physik, Universität Würzburg, D-97074 Würzburg

We present systematic, polarization selective investigations on the coherence properties of AlGaInAs quantum-dot micropillar lasers. The study of the first-order field-correlation function g⁽¹⁾(τ) reveals a polarization splitting of the fundamental mode of nominally circular pillars. It can be shown that the two orthogonally polarized components of the fundamental mode differ in both strength and coherence time. At excitation powers well above the lasing threshold, one mode is dominating the emission with an extinction ratio of more than 99 %. The stronger mode reveals an increase of the coherence time up to a record value of about 20 ns.