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Influence of doping on the performance of terahertz quantum-cascade lasers

Authors :
Alexander Benz
Aaron Maxwell Andrews
Tomas Roch
Gernot Fasching
Karl Unterrainer
M. Martl
Gottfried Strasser
S. Golka
W. Schrenk
Source :
Applied Physics Letters. 90:101107
Publication Year :
2007
Publisher :
AIP Publishing, 2007.

Abstract

The authors present the effects of the doping concentration on the performance of a set of terahertz quantum-cascade lasers emitting around 2.75THz. The chosen design is based on the longitudinal-optical-phonon depopulation of the lower laser state. An identical structure is regrown varying the sheet density from 5.4×109to1.9×1010cm−2. A linear dependency of the threshold current density on the doping is observed. The applied field where lasing takes place is independent of the doping. The field is responsible for the alignment of the cascades and therefore the transport of the electrons through the structure.

Details

ISSN :
10773118 and 00036951
Volume :
90
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........1ffd21feaff855bdd294577276519dcd