Patent ID: 7408968
Filing Date: 2008-08-05
Classification: B82Y,H01S

Abstract:
1. A double wavelength laser device comprising: a first light emitting device for emitting laser light of a first wavelength, the first light emitting device including a first first-conductive-type cladding layer, a first active layer having a first window region in part thereof located in the vicinity of a light emitting edge surface and a first second-conductive-type cladding layer stacked in this order on a substrate; and a second light emitting device for emitting laser light of a second wavelength, the second light emitting device including a second first-conductive-type cladding layer, a second active layer having a second window region in part thereof located in the vicinity of a light emitting edge surface and a second second-conductive-type cladding layer stacked in this order on the substrate, wherein the first active layer is a layer containing AlGaAs, wherein the second active layer is a layer containing AlGaInP, wherein each of the first second-conductive-type cladding layer and the second second-conductive-type cladding layer is a layer containing AlGaInP, and wherein a lattice mismatch value of the first second-conductive-type cladding layer is less than 0 and also less than a lattice mismatch value of the second second-conductive-type cladding layer.