Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.73: Poster
Tuesday, March 24, 2015, 17:00–19:00, C/Foyer
Relative intensity noise reduction of a quantum dot laser subject to optical feedback — Mariangela Gioannini2, •Robert Pawlus1, 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 study the improvement of relative intensity noise (RIN) of an InAs/InGaAs quantum dot (QD) laser by optical feedback (OFB). The laser emits simultaneously at the ground-state (GS) and the excited-state (ES) wavelengths. Recently, switching between GS and ES wavelengths by OFB has been investigated both experimentally and by numerical modeling (M. Virte et al. Appl. Phys. Lett. 105, 121109, 2014). An improvement in RIN by OFB has also recently been reported for a quantum cascade laser (C. Juretzka et al., Electron. Lett. 49, 1548, 2013). Here, we study the influence of GS- and ES-selective OFB on the RIN and emission-state transitions of a QD laser both experimentally and by simulations. Experiments yield a significant RIN reduction when spectrally-selective GS or ES OFB is applied as well as for GS+ES OFB. The observed RIN improvement and emission-state transitions are discussed by means of numerical modeling.