Abstract
In this work, we report on the above-room-temperature continuous-wave operation of InP-based antimony-free triangular quantum well (QW) lasers emitting up to approximately 2.4 µm. X-ray diffraction measurement confirms the favorable structural quality of the highly strained triangular QWs composed of InAs/In0.53Ga0.47As digital alloy. The maximum continuous-wave working temperature reaches 340 K, and the output power at 300 K is about 11 mW/facet at an injection current of 350 mA. The internal quantum efficiency of 58% is deduced at 300 K, and the extrapolated threshold current density for infinite cavity length is 210 A/cm2 per quantum well.
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