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dc.contributor.authorHolzinger, Steffen
dc.contributor.authorKreinberg, Sõren
dc.contributor.authorHokr, Brett H.
dc.contributor.authorSchneider, Christian
dc.contributor.authorHöfling, Sven
dc.contributor.authorChow, Weng W.
dc.contributor.authorPorte, Xavier
dc.contributor.authorReitzenstein, Stephan
dc.identifier.citationHolzinger , S , Kreinberg , S , Hokr , B H , Schneider , C , Höfling , S , Chow , W W , Porte , X & Reitzenstein , S 2018 , ' Determining the linewidth enhancement factor via optical feedback in quantum dot micropillar lasers ' , Optics Express , vol. 26 , no. 24 , pp. 31363-31371 .
dc.descriptionFunding: European Research Council under the European Union’s Seventh Framework Program (ERC Grant Agreement No. 615613); German Research Foundation (CRC 787); U.S. Department of Energy (Contract No. DE-AC04-94AL85000).en
dc.description.abstractThe linewidth enhancement factor α is a key parameter determining the spectral and dynamical behavior of semiconductor lasers. Here, we propose and demonstrate a method for determining this parameter based on a direct measurement of variations in the laser gain and emission spectrum when subject to delayed optical feedback. We then use our approach to determine the pump current dependent linewidth enhancement factor of a high-β quantum dot micropillar laser. The validity of our approach is confirmed comparing it to two conventional methods, one based on the comparison of the linewidths above and below threshold and the other based on injection locking properties. Furthermore, the pump power dependence of α is quantitatively described by simulations based on a quantum-optical model.
dc.relation.ispartofOptics Expressen
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.titleDetermining the linewidth enhancement factor via optical feedback in quantum dot micropillar lasersen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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