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Proceedings Paper

Dual-state lasing and the case against the phonon bottleneck
Author(s): Peter Spencer; Jie Shi; Edmund Clarke; Ray Murray; Mohammad Majid; David Childs; Ryan Alexander; Kristian Groom; Richard Hogg
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Paper Abstract

Quantum Dot lasers exhibit the novel phenomenon of dual state lasing where population inversion can be achieved on two optical transitions within the dots. In principle this might occur if a phonon bottleneck exists to impede relaxation of carriers from the higher energy state. Here we present an alternative explanation whereby different lasing modes compete for carriers and are spatially separable. Evidence comes from a comparison of electrical and optical measurements made on the devices. The evolution of a particular lasing mode depends on diffusion of carriers between dots and we show how, using an equivalent circuit model, this is consistent with our measurements.

Paper Details

Date Published: 12 February 2010
PDF: 11 pages
Proc. SPIE 7616, Novel In-Plane Semiconductor Lasers IX, 761606 (12 February 2010); doi: 10.1117/12.845632
Show Author Affiliations
Peter Spencer, Imperial College London (United Kingdom)
Jie Shi, Imperial College London (United Kingdom)
Edmund Clarke, Imperial College London (United Kingdom)
Ray Murray, Imperial College London (United Kingdom)
Mohammad Majid, The Univ. of Sheffield (United Kingdom)
David Childs, The Univ. of Sheffield (United Kingdom)
Ryan Alexander, The Univ. of Sheffield (United Kingdom)
Kristian Groom, The Univ. of Sheffield (United Kingdom)
Richard Hogg, The Univ. of Sheffield (United Kingdom)

Published in SPIE Proceedings Vol. 7616:
Novel In-Plane Semiconductor Lasers IX
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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