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Proceedings Paper

Carrier dynamical issues for extending the operating wavelength of quantum cascade lasers
Author(s): Paul Harrison; K. Donovan; Robert W. Kelsall; P. Kinsler
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Paper Abstract

Electron-longitudinal optic phonon and electron-electron intersubband scattering rates are calculated for a variety of quantum well systems. It is demonstrated that the internal quantum efficiency of a Terahertz radiative intersubband transition can be greater than in the mid-IR at 4K, however by room temperature has fallen to around 20 percent. A study of the internal quantum efficiency of a Terahertz energy intersubband transition in double and single quantum wells, has shown that the vertical intrawell transition is more efficient than the diagonal interwell transition.

Paper Details

Date Published: 9 September 1999
PDF: 7 pages
Proc. SPIE 3828, Terahertz Spectroscopy and Applications II, (9 September 1999); doi: 10.1117/12.361036
Show Author Affiliations
Paul Harrison, Univ. of Leeds (United Kingdom)
K. Donovan, Univ. of Leeds (United Kingdom)
Robert W. Kelsall, Univ. of Leeds (United Kingdom)
P. Kinsler, Univ. of Leeds (United Kingdom)

Published in SPIE Proceedings Vol. 3828:
Terahertz Spectroscopy and Applications II
J. Martyn Chamberlain, Editor(s)

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