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Proceedings Paper

Many-body effects in quantum dot lasers
Author(s): Hans Christian Schneider; Weng W. Chow; Peter M. Smowton; Emma J. Pearce; Stephan W. Koch
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Paper Abstract

We investigate the influence of the coupling between localized and continuum states on the optical gain and refractive index in self-organized quantum-dot structures under high-excitation conditions. For wide-bandgap nitride-based quantum-dot structures we show that the presence of strong many-body Coulomb interactions and the quantum-confined Stark effect result in absorption/gain features that depend on the quantum-dot dimensions in a nontrivial way. For InAs/GaAs based quantum dots, we investigate the refractive index properties and show that negative α or linewidth enhancement factors may occur in these systems, which makes the beam quality (filamentation) properties of quantum-dot lasers very different from quantum-well lasers. This is consistent with measurements which show a reduction in quantum-dot laser filamentation as the injection level is increased.

Paper Details

Date Published: 25 July 2003
PDF: 7 pages
Proc. SPIE 4986, Physics and Simulation of Optoelectronic Devices XI, (25 July 2003); doi: 10.1117/12.482334
Show Author Affiliations
Hans Christian Schneider, Kaiserslautern Univ. (Germany)
Weng W. Chow, Sandia National Labs. (United States)
Peter M. Smowton, Cardiff Univ. (United Kingdom)
Emma J. Pearce, Cardiff Univ. (United Kingdom)
Stephan W. Koch, Marburg Univ. (Germany)


Published in SPIE Proceedings Vol. 4986:
Physics and Simulation of Optoelectronic Devices XI
Marek Osinski; Hiroshi Amano; Peter Blood, Editor(s)

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