Patent ID: 6333946
Filing Date: 2001-12-25
Classification: B82Y,H01S

Abstract:
A semiconductor laser device comprising:a semiconductor substrate having a first conductivity type and a surface in a crystallographic plane;a lower cladding layer of the first conductivity type disposed on the surface of said semiconductor substrate;an active layer disposed on said lower cladding layer;a first upper cladding layer of a second conductivity type, disposed on said active layer, said first upper cladding layer including a first portion having a forward mesa ridge shape and a second portion extending along sides of a base of the first portion and thinner than the first portion;a current blocking layer disposed on opposite sides of both the first and second portions of the first upper cladding layer; anda second upper cladding layer of the second conductivity type disposed on the first portion of said first upper cladding layer.