Ultrafast Gain Dynamics in Quantum-Dot Amplifiers: Theoretical Analysis and Experimental Investigations
van der Poel, M, Gehrig, E, Hess, O, Birkedal, D and Hvam, J M (2005) Ultrafast Gain Dynamics in Quantum-Dot Amplifiers: Theoretical Analysis and Experimental Investigations IEEE Journal of Quantum Electronics, 41 (9).
Ultrafast gain dynamics in an optical amplifier with an active layer of self-organized quantum dots (QDs) emitting near 1.3 mu m is characterized experimentally in a pump-probe experiment and modeled theoretically on the basis of QD Maxwell-Bloch equations. Experiment and theory are in good agreement and show ultrafast subpicoseconds gain recovery followed by a slower 5 ps recovery. This behavior is found to be mainly caused by longitudinal optical phonon scattering and strongly dependents on electronic structure and confinement energy of the dots. A low amplitude-phase coupling (a factor) is theoretically predicted and demonstrated in the experiments. The fundamental analysis reveals the underlying physical processes and indicates limitations to QD-based devices.
|Divisions :||Faculty of Engineering and Physical Sciences > Physics|
|Date :||1 January 2005|
|Identification Number :||10.1109/JQE.2005.852795|
|Additional Information :||Published in <i>Journal of Quantum Electronics,</i> Vol. 41, Iss. 9. Copyright 2005 IEEE. Click <a href=http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=3>here</a> to access the journal's website.|
|Depositing User :||Mr Adam Field|
|Date Deposited :||27 May 2010 14:07|
|Last Modified :||23 Sep 2013 18:26|
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