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Proceedings Paper

Modelling spin-polarised VCSELs
Author(s): Michael J. Adams; K. Yasin; A. Dyson
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Paper Abstract

In this paper we model vertical cavity surface-emitting lasers (VCSELs) that are optically pumped with circularly polarised light. This pumping scheme produces partial spin alignment of electrons since right-circular polarisation (RCP) excites spin-down electrons and left-circular polarisation excites spin-up electrons. The two spin populations are coupled through spin relaxation with a characteristic time in the order of 1-100 ps. RCP and LCP lasing emission from these populations are coupled through linear birefringence and gain anisotropy (dichroism), each with their own characteristic rates. The well-known spin-flip model (SFM) describes these processes in terms of four rate equations (one each for the complex RCP and LCP fields, one each for spin-up and spin-down electrons). For the special case when the two circularly-polarised field components have the same frequency and maintain a constant phase difference, these may be recast in terms of optical intensities, thus leading to an efficient method for numerical solution in the steady state. We have used this method to systematically investigate the influence of spin relaxation, birefringence and dichroism, and pump ellipticity on the VCSEL output. It is found that the spin relaxation time and the ellipticity of the optical pump have the strongest effect. The method can also be used to investigate the accuracy of approximate solutions of the SFM equations that have been proposed in the literature.

Paper Details

Date Published: 7 July 2005
PDF: 8 pages
Proc. SPIE 5840, Photonic Materials, Devices, and Applications, (7 July 2005); doi: 10.1117/12.609111
Show Author Affiliations
Michael J. Adams, Univ. of Essex (United Kingdom)
K. Yasin, Univ. of Essex (United Kingdom)
A. Dyson, Univ. of Essex (United Kingdom)

Published in SPIE Proceedings Vol. 5840:
Photonic Materials, Devices, and Applications
Goncal Badenes; Derek Abbott; Ali Serpenguzel, Editor(s)

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