Patent ID: 7433380

Claim:
A semiconductor laser device, comprising: a substrate; and a plurality of light-emitting elements emitting light with different wavelengths and integrated on the substrate, wherein the light-emitting elements include: a first light-emitting element emitting light with a relatively short first wavelength; and a second light-emitting element emitting light with a relatively long second wavelength, each of the first and second light-emitting elements includes an active layer provided on the substrate, a first cladding layer provided on the active layer, an etching stopper layer provided on the first cladding layer, and an ridge portion provided on the etching stopper layer, the ridge portion includes a second cladding layer and a contact layer provided on the second cladding layer, the distance from the upper surface of the active layer to the upper end of the ridge portion is the same between the first light-emitting element and the second light-emitting element, the height of the ridge portion in the second light-emitting element is lower than that of the ridge portion in the first light-emitting element, the thickness of the etching stopper layer in the second light-emitting element is larger than that of the etching stopper layer in the first light-emitting element, and the thickness of the first cladding layer in the second light-emitting element is larger than that of the first cladding layer in the first light-emitting element.