TITLE

Population inversion by resonant magnetic confinement in terahertz quantum-cascade lasers

AUTHOR(S)
Scalari, Giacomo; Blaser, Stéphane; Ajiili, Lassaad; Faist, Jérôme; Beere, Harvey; Linfield, Edmund; Ritchie, David; Davies, Giles
PUB. DATE
October 2003
SOURCE
Applied Physics Letters;10/27/2003, Vol. 83 Issue 17, p3453
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Ultralow-threshold terahertz laser emission exploiting in-plane confinement arising from perpendicular magnetic field applied on a quantum-cascade structure is reported. A special design strategy has been adopted that takes advantage of the selective opening and closing of relaxation channels by elastic scattering between Landau levels. The key effect is a reduction of the lower state lifetime of the lasing transition that produces population inversion. The structure shows laser action only with applied magnetic field and yields threshold current densities as low as 19 A/cm[sup 2] at 4.2 K and 32 A/cm[sup 2] at 60 K at a frequency of 3.6 THz. © 2003 American Institute of Physics.
ACCESSION #
11123041

 

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