Comparison of the quantum efficiencies of interwell and intrawell radiative transitions in quantum cascade lasers

被引：15

作者：

Donovan, K ^{[1
]}

Harrison, P ^{[1
]}

Kelsall, RW ^{[1
]}

机构：

[1] Univ Leeds, Sch Elect & Elect Engn, Inst Microwaves & Photon, Leeds LS2 9JT, W Yorkshire, England

来源：

APPLIED PHYSICS LETTERS | 1999年 / 75卷 / 14期

关键词：

D O I：

10.1063/1.124895

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A theoretical study has been made to compare the quantum efficiencies of interwell and intrawell radiative transitions in quantum cascade lasers based on AlxGa1-xAs/GaAs technology. Radiative and nonradiative intersubband transition rates were calculated for a range of temperatures between 4 and 300 K at an applied electric field of 4 kV cm-1 for structures designed to emit in both mid-infrared and far-infrared frequency ranges. It is found that the internal quantum efficiency of mid-infrared devices is a maximum for diagonal, or interwell, transitions. Conversely, for the far-infrared devices, the quantum efficiency is a maximum for vertical, or intrawell, transitions. (C) 1999 American Institute of Physics. [S0003-6951(99)01940-3].

引用

页码：1999 / 2001

页数：3

共 15 条

[1] Maximizing the population inversion by optimizing the depopulation rate in far-infrared quantum cascade lasers [J].