Patent ID: 7558306

Claim:
A semiconductor laser device comprising: a ridge portion in which a lower clad layer, an active layer, a first upper clad layer, a second upper clad layer, and an electrode layer are stacked in order; first side portions which are placed on both outer sides of the ridge portion and in which the lower clad layer, the active layer, the first upper clad layer, and a buried layer having a refractive index smaller than that of the first upper clad layer are stacked in order wherein a bottom-most portion of the buried layer extends parallel to the active layer; and second side portions which are placed on both outer sides of the first side portions and in which the lower clad layer, the active layer, the first upper clad layer, and a light absorption layer are stacked in order, and in which the buried layer is not stacked, wherein a width of the first side portions is configured such that guided light does not enter the second side portions, and the light absorption layer is in electrical contact with the electrode layer.