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A highly strained GaAs/GaAs0.64Sb0.36 single quantum well laser has been grown on GaAs (100) substrate by using solid source molecular beam epitaxy. The uncoated broad-area laser demonstrates 1.292 μm pulsed operation with a low threshold current density of 300 A/cm2. The spontaneous emission of the laser was also studied. The result reveals that the Auger recombination component dominates the threshold current at high temperature.