Patent ID: 7711023
Filing Date: 2010-05-04
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser device, which has a self-sustained pulsation characteristic, comprising: a lower clad layer formed on a semiconductor substrate; an active layer formed on the lower clad layer; a first upper clad layer formed on the active layer; a semiconductor layer formed on the first upper clad layer; and a second upper clad layer formed on the semiconductor layer, wherein: the lower clad layer, the first upper clad layer and the second upper clad layer each made of AlGaInP have a positive lattice mismatch, which is in a range of 2.0×10 the semiconductor layer has a negative lattice mismatch, which is in a range of −2.0×10 impurity concentrations of the first and second upper clad layers are not less than 3×10 a well layer composing the active layer has the compressive distortion with respect to the semiconductor substrate and a film thickness of not less than 20 nm, and the semiconductor layer is made of Ga