A high growth temperature step used for the GaAs spacer layer is shown to significantly improve the performance of 1.3 µm multilayer InAs/GaAs quantum-dot lasers. Extremely low room-temperature continuous-wave threshold current densities of 32.5 and 17 A/cm2 are achieved for a three-layer device with as-cleaved facets and high-reflectivity coated facets, respectively.
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Sellers et al. (2004) studied this question.
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