Gain characteristics of quantum-dot injection lasers

Citation
Ae. Zhukov et al., Gain characteristics of quantum-dot injection lasers, SEMICONDUCT, 33(9), 1999, pp. 1013-1015
Citations number
11
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SEMICONDUCTORS
ISSN journal
10637826 → ACNP
Volume
33
Issue
9
Year of publication
1999
Pages
1013 - 1015
Database
ISI
SICI code
1063-7826(199909)33:9<1013:GCOQIL>2.0.ZU;2-I
Abstract
The current dependence of the optical gain in lasers based on self-organize d InGaAs quantum dots in a AlGaAs/GaAs matrix is investigated experimentall y. A transition from lasing via the ground state of quantum dots to lasing via an excited state is observed. The saturated gain in the latter case is approximately four times greater than for the ground state. This result is attributable to the fourfold degeneracy of the excited level of quantum dot s. The effect of the density of the quantum-dot array on the threshold char acteristics is investigated. A lower-density array of dots is characterized by a lower threshold current density in the low-loss regime, because the t ransmission current is lower, while dense quantum-dot arrays characterized by a high saturated gain are preferable at high threshold gains. (C) 1999 A merican Institute of Physics. [S1063-7826(99)02309-1].