Submilliampere threshold current pseudomorphic InGaAs/AlGaAs buried-heterostructure quantum well lasers grown by molecular beam epitaxy

Abstract
We report on low threshold current strained InGaAs/AlGaAs single quantum well lasers grown by molecular beam epitaxy. Broad‐area threshold current densities of 114 A/cm2 at 990 nm were measured for 1540‐μm‐long lasers. Threshold currents of 2.4 mA at 950 nm were obtained for an uncoated buried‐heterostructure device with a 2‐μm‐wide stripe and 425‐μm‐long cavity. With reflective coatings the best device showed 0.9 mA threshold current (L=225 μm). Preliminary modulation measurements show bandwidths up to 5.5 GHz limited by the detector response.