Patent ID: 6891872
Filing Date: 2005-05-10
Classification: H01S

Abstract:
1. A semiconductor laser device comprising: a substrate; a first conductivity type cladding layer; an emission layer; a second conductivity type carrier blocking layer; a second conductivity type cladding layer containing Al as a group III element and formed with a ridge portion; a current blocking layer, formed on said second conductivity type cladding layer around said ridge portion, containing Al as a group III element, wherein an angle θ of inclination on a side surface of said ridge portion with respect to an upper surface of said substrate is at least 70° and not more than 117°, a distance t between said emission layer and said current blocking layer satisfies a relation of t≦0.275/(1−(X2−X1)) micrometer assuming that X1 represents a composition ratio of Al in group III elements forming said second conductivity type cladding layer, X2 represents a composition ratio of Al in group III elements forming said current blocking layer, wherein said distance t includes the thickness of said second conductivity type cladding layer and the thickness of said carrier blocking layer, and a lower width W of said ridge portion is at least 2 μm and not more than 5 μm.