The electron population in the excited miniband of quantum cascade structures with intrinsic superlattice active regions is extracted from the fine structure analysis of spontaneous interminiband electroluminescence spectra. At current densities typical of laser thresholds, the electrons injected into the excited miniband of a (GaInAs)(6 nm)/(AlInAs)(1.8 nm) superlattice are described by a nonequilibrium thermal distribution characterized by temperatures T-e> 200 K, much higher than the lattice temperature T-L=15 K.
Electronic distribution in superlattice quantum cascade lasers / Troccoli, M.; Scamarcio, G.; Spagnolo, V.; Tredicucci, A.; Gmachl, C.; Capasso, F.; Sivco, D. L.; Cho, A. Y.; Striccoli, M.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 77:8(2000), pp. 1088-1090. [10.1063/1.1289798]
Electronic distribution in superlattice quantum cascade lasers
Spagnolo, V.;
2000-01-01
Abstract
The electron population in the excited miniband of quantum cascade structures with intrinsic superlattice active regions is extracted from the fine structure analysis of spontaneous interminiband electroluminescence spectra. At current densities typical of laser thresholds, the electrons injected into the excited miniband of a (GaInAs)(6 nm)/(AlInAs)(1.8 nm) superlattice are described by a nonequilibrium thermal distribution characterized by temperatures T-e> 200 K, much higher than the lattice temperature T-L=15 K.| File | Dimensione | Formato | |
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