Patent ID: 7532655

Claim:
A semiconductor light emitting device, comprising: a substrate; a first conductivity type first cladding layer on said substrate; an active layer on said first cladding layer; and a second conductivity type second cladding layer on said active layer, a part thereof having a ridge-shaped portion as a current narrowing structure, wherein, said ridge-shaped portion of said second cladding layer includes a first ridge-shaped layer on the side closest to said active layer and having a higher bandgap than said first cladding layer and a second ridge-shaped layer on the side distant from the active layer and having a relatively low bandgap, said first ridge-shaped layer and said second ridge-shaped layer are a layer with a relatively high aluminum composition ratio and a layer with a relatively low aluminum composition ratio, respectively, an aluminum composition ratio X1 of said first ridge-shaped layer is 0.60<X1<0.70, and an aluminum composition ratio X2 of said second ridge-shaped layer is X2<X1.