The threshold temperature dependence for quantum-dot (QD) lasers with different degrees of inhomogeneous broadening are compared. By reducing the inhomogeneous linewidth, the "negative" temperature dependence due to thermal coupling of the QD ensemble can be nearly eliminated, Stable ground state lasing is obtained with a single-layer QD density of -5/spl times/10/sup 10/ cm/sup -2/ for a long cavity laser, while lower gain QDs and shorter cavity lengths lase on well-resolved higher energy levels.
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Zou et al. (1998) studied this question.
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