High-power inter-miniband lasing in intrinsic superlattices

Alessandro Tredicucci, Federico Capasso, Claire Gmachl, Deborah L. Sivco, Albert L. Hutchinson, Alfred Y. Cho, Jérome Faist, Gaetano Scamarcio

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We report the realization of a mid-infrared (λ≃7μm) quantum-cascade laser, in which the emission process takes place between the two lowest minibands of an intrinsic superlattice. Contrary to previous lasers based on doped superlattices, here the dopants are located only inside suitably designed injector regions, where positive ionized donors and negative electrons are arranged to compensate the applied external field across the superlattices. This reduces impurity scattering and translates into low threshold currents (4.2kA/cm2 at 10 K) and into room temperature operation, without compromising the large current-carrying capabilities of the minibands. Peak powers of ∼1.3W per facet have been obtained from broad-area devices at 10 K, with still more than 1 W at 120 K and 400 mW at 200 K. Effects related to the finite size of the superlattices become visible in the spectral properties, owing to the reduced broadening, and have to be taken into account to accurately describe the laser's behavior.

Original languageAmerican English
Pages (from-to)2388-2390
Number of pages3
JournalApplied Physics Letters
Issue number19
StatePublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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