Patent ID: 7751454

Claim:
A semiconductor laser device comprising: semiconductor layers including an n-type semiconductor layer, an active layer and a p-type semiconductor layer, said semiconductor layers having a stripe-shaped waveguide region formed therein by forming a ridge on said p-type semiconductor layer; a p-side ohmic electrode formed on said ridge of p-type semiconductor layer; and a p-side pad electrode covering said p-side ohmic electrode and extending over other portions of said p-side semiconductor layer than said ridge, said p-side pad electrode being for connecting a wire thereon, wherein at least two p-side protruding portions having different width with each other are formed on both sides of said ridge and in the vicinity of the end face of said p-type semiconductor layer, said p-side protruding portions having substantially the same height as or larger height than said ridge of said p-type semiconductor layer and, in a cross section that is parallel to the length of said stripe-shaped waveguide region and is taken through one of the p-side protruding portions, a top surface of the p-side protruding portion is higher than a top surface of the central portion of said p-type semiconductor layer between two resonator surfaces of the semiconductor laser device, wherein said central portion in said cross section is away from the vicinity of the end face of said p-type semiconductor layer.