@article{866116f5acd948ab82fb645038ba672f,
title = "Dependence of threshold current density on the waveguide ridge width in quantum-cascade lasers",
abstract = "We make a systematic study to find the dependence of the threshold current density of a mid-infrared quantum-cascade laser on the waveguide ridge width. The optical and thermal parameters of the waveguide are calculated with a finite-element method, and gain is found from a self-consistent rate equation model with energy-balance. The results show the existence of an optimal ridge width that minimizes the threshold current density of the laser. The influence of the interface roughness parameters on laser performance is also discussed.",
keywords = "Intersubband transitions, laser modeling, mid-infrared, quantum-cascade laser",
author = "Gabriel Beji and Zoran Ikoni{\'c} and Dragan Indjin and Evans, {Craig A.} and Paul Harrison",
note = "Funding Information: Manuscript received December 10, 2009; revised May 18, 2010; accepted May 30, 2010. Date of current version July 23, 2010. This work was supported in part by NATO Science for Peace Collaborative Linkage Grant Program under project CBP.EAP.CLG 983316, and in part by the British Council/DAAD Academic Research Collaboration Program. The work of Gabriel Beji was funded by the School of Electronic and Electrical Engineering, University of Leeds, and the Engineering and Physical Sciences Research Council, U.K.",
year = "2010",
month = sep,
day = "1",
doi = "10.1109/JQE.2010.2052350",
language = "English",
volume = "46",
pages = "1320--1326",
journal = "IEEE Journal of Quantum Electronics",
issn = "0018-9197",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "9",
}