Patent ID: 6118799
Filing Date: 2000-09-12
Classification: B82Y,H01S

Abstract:
A semiconductor laser device comprising in the following sequence:a substrate;a first clad layer having a first conductive type,a first wave guide layer having a first conductive type,a first carrier block layer having a first conductive type, and confining carriers to an active layer;the active layer;a second carrier block layer having a second conductive type, and confining carriers to the active layer;a second wave guide layer having a second conductive type, anda second clad layer having a second conductive type, and further comprising:both said first and second carrier block layers having energy gaps larger than those of said first and second wave guide layers;both said first and second clad layers having refractive indices lower than those of said first and second wave guide layers;a current blocking layer, formed so that at least a part of one of the first and second said wave guide layer is interposed between the current blocking layer and the nearer carrier block layer, having the opposite conductive type to that of the adjacent wave guide layer, and having a refractive index lower than refractive indices of said adjacent wave guide layer, andsaid current blocking layer being formed from two portions so as to sandwich a stripe-shaped active region therebetween to create a refractive index difference between the active region and buried regions where each of the current blocking layers exists to form a refractive index guide structure.