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

K. Donovan, P. Harrison, R. W. Kelsall

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

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 1 and 300 k at an applied electric field of 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.
Original languageEnglish
Pages (from-to)1999-2001
Number of pages3
JournalApplied Physics Letters
Volume75
Issue number14
Early online date30 Sep 1999
DOIs
Publication statusPublished - 4 Oct 1999
Externally publishedYes

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