Patent ID: 6909733

Claim:
A semiconductor laser device having an active layer, acting as a region for generating laser, provided on a substrate, said semiconductor laser device comprising: an n-type cladding layer, formed of a first semiconductor containing two or more component elements but containing no phosphor, underlying said active layer; and a p-type cladding layer for defining a barrier height, said p-type cladding layer being formed of a second semiconductor containing four or more component elements and being disposed opposite to said n-type cladding layer to sandwich said active layer between said n-type cladding layer and said p-type cladding layer, wherein said second semiconductor includes more component elements than said first semiconductor, and a potential difference between conduction band edges of said p-type cladding layer for defining a barrier height and said active layer is greater than a potential difference between conduction band edges of said n-type cladding layer and said active layer.