Patent ID: 7164701

Claim:
A semiconductor laser comprising: a first conductive type clad layer; a light-emitting layer formed on the first conductive type clad layer and having an active layer made of Al v Ga 1-v As (where 0≦v<x3) to emit light by current injection; a second conductive type first clad layer formed on the light-emitting layer; a second conductive type second clad layer formed in a stripe shape on a part of the second conductive type first clad layer; a current-blocking layer formed in both sides of the second conductive type second clad layer and having a larger band gap than those of the second conductive type first and second clad layers; and a second conductive type third clad layer made of Al x3 Ga 1-x3 As (where 0.40≦x3≦0.46) formed on the second conductive type second clad layer and the current-blocking layer.