Picture of smart phone in human hand

World leading smartphone and mobile technology research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by Strathclyde researchers from the Department of Computer & Information Sciences involved in researching exciting new applications for mobile and smartphone technology. But the transformative application of mobile technologies is also the focus of research within disciplines as diverse as Electronic & Electrical Engineering, Marketing, Human Resource Management and Biomedical Enginering, among others.

Explore Strathclyde's Open Access research on smartphone technology now...

Polarization properties in the transition from below to above lasing threshold in broad-area vertical-cavity surface-emitting lasers

Schulz-Ruhtenberg, M. and Babushkin, I. V. and Loiko, N. A. and Huang, K. F. and Ackemann, T. (2010) Polarization properties in the transition from below to above lasing threshold in broad-area vertical-cavity surface-emitting lasers. Physical Review A, 81 (2). ISSN 1094-1622

[img]
Preview
PDF
Schulz_Ruhtenberg_PRA_81_023819_2010_polbelowthreshold.pdf - Final Published Version

Download (757kB) | Preview

Abstract

For highly divergent emission of broad-area vertical-cavity surface-emitting lasers, a rotation of the polarization direction by up to 90 degrees occurs when the pump rate approaches the lasing threshold. Well below threshold the polarization is parallel to the direction of the transverse wave vector and is determined by the transmissive properties of the Bragg reflectors that form the cavity mirrors. In contrast, near-threshold and above-threshold emission is more affected by the reflective properties of the reflectors and is predominantly perpendicular to the direction of transverse wave vectors. Two qualitatively different types of polarization transition are demonstrated: an abrupt transition, where the light polarization vanishes at the point of the transition, and a smooth transition, where it is significantly nonzero during the transition.