Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Poster Session I
HL 13.84: Poster
Monday, March 12, 2018, 17:30–19:30, Poster B
Intensity noise of a two-state quantum dot laser — •Robert Pawlus1, Lorenzo L. Columbo2, Paolo Bardella2, Stefan Breuer1, and Mariangela Gioannini2 — 1Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany — 2Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
We study experimentally and by numerical simulations the intensity noise behavior of an InAs/InGaAs quantum dot (QD) laser emitting simultaneously at the ground-state (GS) and the excited-state (ES) wavelengths. Experimentally, a reduction in power fluctuations up to 4 dB is found when GS and ES emit simultaneously as compared to the case of single GS or ES emission. This stability is also studied by spectrally resolved GS and ES time-signal analysis. By means of numerical simulations we explain this phenomenon and qualitatively reproduce its trend with the laser biasing conditions. The coupling of GS and ES emissions trough the common carrier reservoir is identified as the underlying physical mechanism leading to a quasi anti-phase dynamics.