Maximizing the population inversion by optimizing the depopulation rate in far-infrared quantum cascade lasers

被引：6

作者：

Donovan, K ^{[1
]}

Harrison, P ^{[1
]}

Kinsler, P ^{[1
]}

Kelsall, RW ^{[1
]}

机构：

[1] Univ Leeds, Leeds LS2 9JT, W Yorkshire, England

来源：

SUPERLATTICES AND MICROSTRUCTURES | 1999年 / 25卷 / 1-2期

关键词：

population inversion; anticrossing; far-infrared; quantum cascade laser;

D O I：

10.1006/spmi.1998.0661

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Electron-LO phonon and electron-electron transition rates ape calculated for a three-level triple quantum well system to be employed as a laser operating in the far-infrared (30-300 mu m) or terahertz (1-10 THz) region. The population ratio is determined from the ratio of the carrier lifetimes in levels \3] and \2]. The most effective way of depopulating the lower laser level is found to be by LO phonon scattering to a strongly coupled state, as occurs at an anticrossing. Back scattering of carriers from level \1] to level \2] is significant at room temperature, but a population ratio of approximately 5 is possible nonetheless. (C) 1999 Academic Press.

引用

页码：373 / 376

页数：4

共 7 条

[1] Engineering the electron-phonon scattering rates in the active regions of quantum cascade lasers operating beyond 30 mu m [J].