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We demonstrate the p-doping effect on lasing output and threshold current density. The lasing wavelength peak became narrower as the doping concentration increases and has a red shift which consistent with optical absorption ground state.
We have measured the spontaneous emission rates, absorption, and gain spectra of quantum dots between 20 K and 350 K using the segmented contact method, exploiting self assembled dots with a bimodal size distribution. At 20 K, we find a linear relationship between the radiative rates of the ground states of small and large sets of dots, and using absorption data we show the slope corresponds to random...
Greatly improved threshold current and modal gain performance of 1.3 mum quantum dot lasers is achieved by engineering the GaAs spacer layers between dot layers to improve dot homogeneity and enable closer dot layers.
The measured non-radiative current varies linearly with ground state radiative current for InAs dots, in agreement with calculations for localised recombination using a radiative lifetime deduced from absorption data, and non-radiative lifetime of 0.8 ns.
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