Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.74: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Amplitude stability of a continuous-wave emitting two-state InAs/InGaAs quantum-dot laser: experiment and simulation — •Robert Pawlus1, Mariangela Gioannini2, Lukas Drzewietzki1, Sébastien Hartmann1, Wolfgang Elsäßer1, and Stefan Breuer1 — 1Institute of Applied Physics, Technische Universität Darmstadt, Germany — 2Dipartimento di Elettronica, Politecnico di Torino, Italy
We experimentally and numerically study the amplitude stability of an InAs/InGaAs quantum dot (QD) laser emitting at a ground-state (GS) and an excited-state (ES) wavelength of 1250 nm and 1180 nm. Two-state QD lasers form an attractive model system to study the particular carrier dynamics in semiconductor lasers. In [1] for example, GS and ES output power fluctuations versus time have experimentally been observed. Recently, coupled steady-state power emitted by a two-state QD laser was reported where the carrier coupling between GS and ES could be identified as its origin [2]. In this work, we extend these initial investigations towards a comprehensive study of the spectrally-resolved amplitude stability of GS and ES in dependence on laser biasing conditions. We find a improvement in stability up to a factor of 20 dB when GS and ES emit simultaneously. In addition, we investigate and explain the specific trends of stability in dependence on the laser biasing conditions and related advantages based on the coupling of GS and ES. [1] E. A. Viktorov et al. Opt. Lett. 31, 2302 (2006). [2] M. Gioannini et al., Opt. Express 22, 23402 (2014).