Interconnection between ground state and excited state gain in InAs/GaAs quantum dot semiconductor optical amplifiers

Crowley, M. T. and Andreev, A. D. and Piwonski, T. and Houlihan, J. and O'Reilly, E. P. and Huyet, G. (2009) Interconnection between ground state and excited state gain in InAs/GaAs quantum dot semiconductor optical amplifiers. Physica Status Solidi B-Basic Solid State Physics, 246 (4). pp. 868-871.

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Abstract

Different energy levels are generally assumed to be associated with ground state (GS) and excited state (ES) gain in semiconductor qunatum dot lasers and amplifiers. We present calculations based on 8 band k.p Hamiltonian which show that this is not the case. Two distinct absorption bands are calculated due to transitions between the GS electrons and all dot hole states. In additon to the peak due to transitions between GS electron and GS hole levels, a higher energy band is also calculated due ot transistions between GS electrons and highly excited dot hole states. We demonstrate that the removal of electron-hole pairs through simulated emission at the ES gain maximum can result in an amplitude reduction for a probe pulse tuned to the GS gain maximum, due to the existence of these higher energy transitions, and also due to the effects of two photon absorption. We also find that the instatneous phase change at the ES gain maximum due to dot to dot interband transistions is small compared to the measured value. (c) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type: Article
Additional Information: ISI Document Delivery No.: 436HO Times Cited: 1 Cited Reference Count: 14 Crowley, M. T. Andreev, A. D. Piwonski, T. Houlihan, J. O'Reilly, E. P. Huyet, G. 5th International Conference on Semiconductor Quantum Dots MAY 11-16, 2008 Gyeongju, SOUTH KOREA WILEY-V C H VERLAG GMBH WEINHEIM
Uncontrolled Keywords: DYNAMICS LASERS INDEX
Departments or Groups: Optics Research Group
Divisions: School of Science > Department of Computing, Maths and Physics
Depositing User: John Houlihan
Date Deposited: 19 Nov 2012 16:26
Last Modified: 22 Aug 2016 10:26
URI: http://repository.wit.ie/id/eprint/1848

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