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GaInAs/GaAs quantum-dot lasers were fabricated by self-organized growth in a molecular beam epitaxy system. By using a single active layer, lasers with low-threshold current densities (Jth=144 A/cm2 for a 2 mm long device) and high internal quantum efficiencies (90%) were obtained. Ground-state lasing of the quantum dots was observed up to a device temperature of 214 °C.
Schäfer et al. (Mon,) studied this question.
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