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In spite of the almost ideal variation of the radiative current of 1.3 mum GaAsSb/GaAs-based lasers, the threshold current, Jth, is high due to non-radiative recombination accounting for 90% Jth near room temperature. This also gives rise to low T0 values ~60 K close to room temperature, similar to that for InGaAsP/InP
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