Many-body effects in quantum dot lasers

Schneider, Hans C., Chow, Weng W., Smowton, Peter Michael ORCID: https://orcid.org/0000-0002-9105-4842, Pearce, Emma J. and Koch, Stephan W. 2003. Many-body effects in quantum dot lasers. Presented at: Physics and Simulation of Optoelectronic Devices XI, San Jose, CA, USA, 25 January 2003. Published in: Osinski, M., Amano, H. and Blood, Peter eds. Physics and simulation of optoelectronic devices XI. Proceedings of SPIE (4986) Bellingham, WA: SPIE, p. 29. 10.1117/12.482334

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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.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	SPIE
ISBN:	9780819447869
ISSN:	0277786X
Related URLs:	Publisher
Last Modified:	25 Oct 2022 09:40
URI:	https://orca.cardiff.ac.uk/id/eprint/59544

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