Patent ID: 8422526

Claim:
A semiconductor laser device comprising: a semiconductor multilayer structure selectively grown on a substrate other than on a predetermined region of the substrate, wherein the semiconductor multilayer structure includes a cladding layer of a first conductivity type, an active layer, and a cladding layer of a second conductivity type, and has a stripe-shaped optical waveguide extending in a direction intersecting a front facet through which light is emitted, the active layer has an abnormal growth portion formed at a peripheral edge of the predetermined region, and a larger forbidden band width portion formed around the abnormal growth portion and having a larger width of a forbidden band than that of a portion other than the abnormal growth portion of the active layer, and the optical waveguide is spaced apart from the abnormal growth portion and includes the larger forbidden band width portion at the front facet, and a length of the predetermined region in a direction along the optical waveguide is smaller than a length of the optical waveguide.