Patent ID: 6298079
Filing Date: 2001-10-02
Classification: H01S

Abstract:
A semiconductor laser comprising:a substrate;a buffer layer made of GaN;a lower cladding layer made of a first conductive type Al.sub.z Ga.sub.1-z N (0<z<1);an active layer made of In.sub.x Ga.sub.1-x N (0<x<1);an absorption layer made of a second conductive type In.sub.r Ga.sub.1-r N (0<r<1,r.ltoreq.x);a second upper cladding layer made of a second conductive type Al.sub.z Ga.sub.1-z N (0<z<1);a current blocking layer made of a first conductive type AlN having a stripe-like opening;a third upper cladding layer made of a second conductive type Al.sub.z Ga.sub.1-z N (0<z<1);a second conductive type contact layer;an upper electrode being provided on said contact layer; anda lower electrode being connected to said lower cladding layer or to said buffer layer.