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Abstract
We have experimentally found that the threshold current density of 1.5 μm tensile-strained single quantum well lasers decreases with increased tensile strain. A threshold current density as low as of 197 A/cm2 is obtained with an In0.3Ga0.7As well. With semi-insulating current blocking layers and high reflection facet coatings, a threshold current as low as 2 mA is obtained from 150 μm long lasers and a maximum CW operation temperature of 135°C is achieved from 1 mm long lasers.
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