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Optical pumping of quantum dot micropillar lasers
Citation key 2021_03_Andreoli
Author L. Andreoli and X. Porte and T. Heuser and J. Große and B. Moeglen-Paget and L. Furfaro and S. Reitzenstein and D. Brunner
Pages 9084–9097
Year 2021
DOI 10.1364/OE.417063
Journal Opt. Express
Volume 29
Number 6
Month Mar
Publisher OSA
Abstract Arrays of quantum dot micropillar lasers are an attractive technology platform for various applications in the wider field of nanophotonics. Of particular interest is the potential efficiency enhancement as a consequence of cavity quantum electrodynamics effects, which makes them prime candidates for next generation photonic neurons in neural network hardware. However, particularly for optical pumping, their power-conversion efficiency can be very low. Here we perform an in-depth experimental analysis of quantum dot microlasers and investigate their input-output relationship over a wide range of optical pumping conditions. We find that the current energy efficiency limitation is caused by disadvantageous optical pumping concepts and by a low exciton conversion efficiency. Our results indicate that for non-resonant pumping into the GaAs matrix (wetting layer), 3.4\&\#x0025; (0.6\&\#x0025;) of the optical pump is converted into lasing-relevant excitons, and of those only 2\&\#x0025; (0.75\&\#x0025;) provide gain to the lasing transition. Based on our findings, we propose to improve the pumping efficiency by orders of magnitude by increasing the aluminium content of the AlGaAs/GaAs mirror pairs in the upper Bragg reflector.
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