Patent ID: 7693202
Filing Date: 2010-04-06
Classification: B82Y,G11B,H01S

Abstract:
1. A self oscillation type semiconductor laser device comprising: a first double hetero structure for emitting light of a first wavelength; and a second double hetero structure for emitting light of a second wavelength different from the first wavelength, the first double hetero structure and the second double hetero structure being provided on one semiconductor substrate of a first conductivity type, wherein: the first double hetero structure includes: the first second-conductivity type cladding layer and the second second-conductivity type cladding layer are made of the same material and have different impurity concentrations, the first active layer is a quantum well active layer including GaAs, the second active layer is a quantum well active layer including GaInP, the total thickness of the well layers of the second active layer is larger than the total thickness of the well layers of the first active layer, the second second-conductivity type cladding layer has a smaller thickness than the first second-conductivity type cladding layer, and both of the first double hetero structure and the second double hetero structure cause self oscillation.