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- W2004688263 abstract "Theoretical calculations of gain, differential gain, and threshold current for GaAs/AlGaAs quantum-wire lasers grown in V-shaped grooves [E. Kapon, D.M. Hwang and R. Bhat, Phys. Rev. Lett. 63 (1989) 430] are presented. The model is based on the density-matrix formalism with intraband relaxation. The electronic structure calculations incorporate band mixing and the realistic geometry of the laser structure. Although the splitting of the valence subbands is much less than kBT at room temperature, the low effective-mass conduction subbands have a splitting comparable to kBT, leading to a modest sharpening of the density of states associated with the conduction band. Because of the small overlap of the optical field with the active region for a single quantum wire, lasing threshold is reached only when several subbands are filled. Consequently, the reported operation of the single-quantum-wire laser corresponds closely to that of a very narrow quantum-well laser with modest quasi-one-dimensional enhancement. In addition, we consider the case of a stack of quantum wires in which the optical-confinement factor can be significantly higher than for a single quantum wire. We predict minimum threshold currents per wire as low as 100 μA." @default.
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- W2004688263 date "1992-01-01" @default.
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- W2004688263 title "Theory of gain in GaAs/AlGaAs V-groove quantum-wire lasers" @default.
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- W2004688263 doi "https://doi.org/10.1016/0925-3467(92)90016-g" @default.
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