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Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 18: Semiconductor Lasers II

HL 18.9: Vortrag

Montag, 20. März 2017, 17:15–17:30, POT 06

Measuring the Photon Number Distribution of a Bimodal Quantum Dot Microlaser — •Elisabeth Schlottmann1, Martin von Helversen1, Marco Schmidt1,2, Felix Krüger1, Heinrich A.M. Leymann3, Thomas Lettau4, Alexander Foerster4, Mikayel Khanbekyan4, Christian Schneider5, Sven Höfling5, Martin Kamp5, Jörn Beyer2, Jan Wiersig4, and Stephan Reitzenstein11Technische Universität Berlin — 2Physikalisch Technische Bundesanstalt — 3MPIPKS Dresden — 4Universität Magdeburg — 5Universität Würzburg

Microlasers operating in the regime of cavity quantum electrodynamics (cQED) exhibit enhanced coupling of spontaneous emission into the cavity mode. This leads to a smooth transition from thermal to coherent emission at threshold which makes it difficult to prove lasing solely by the input-output behavior. Against this background, measuring the second order auto-correlation function g(2)(τ) has become a valuable tool to identify laser action. Beyond that, g(2)(τ) is also indicative for superradiance, mode-switching or thermal emission.
Here, we apply for the first time a photon number resolving transition edge sensor (TES) to directly access the photon number distribution of quantum dot microlasers. Our combined experimental and theoretical study demonstrates that TES detectors can be used to differentiate between mode-switching and thermal emission of bimodal microlasers. Both show a g(2)(0)≈ 2, but in the case of switching, a linear combination of a thermal and a coherent distribution appears in the photon number distribution.

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