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We report the influences of quantum dot (QD) shape on the lasing characteristics such as threshold current, slope efficiency, and wavelength stability. The average heights of the shape-engineered InAs/InAlGaAs QDs (SEQDs) and the conventionally-grown Stranski-Krastanov InAs QDs (CQD) were 10±0.5 and 2.5±0.5 nm, respectively. For the cavity length of 0.5 mm, the threshold current of the laser diodes...
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