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We realized a triple-stacked 1.3-mum InAs quantum dot (QD) with a high density of 2.4times1011 cm-2 and a high uniformity of below 24 meV that employs an As2 source and a gradient composition (GC) strain-reducing layer (SRL) grown on a GaAs substrate. We demonstrated the 1.3-mum wavelength emission of this triple-stacked QD laser with a 0.92-mm cavity length and a cleaved facet at room temperature...
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