Patent ID: 6414977
Filing Date: 2002-07-02
Classification: H01S

Abstract:
A semiconductor laser device comprising:a semiconductor substrate of a first conductivity type; a III-V semiconductor first cladding layer of a first conductivity type, disposed on the semiconductor substrate; a III-V semiconductor active layer having a smaller band gap than the first cladding layer, disposed on the first cladding layer; a III-V semiconductor first second-cladding layer of a second conductivity type, opposite the first conductivity type, having a larger band gap than the active layer, and disposed on the active layer; a III-V semiconductor current blocking layer of the first conductivity type, having a larger band gap than the active layer, disposed on the first second-cladding layer, and having a stripe-shaped opening; a III-V semiconductor buffer layer of the second conductivity type, having a larger band gap than the active layer, and disposed on a surface of the current blocking layer, facing the opening; and a III-V semiconductor second second-cladding layer of the second conductivity type, having a larger band gap than the active layer, and disposed on the first second-cladding layer, facing the opening, and the current blocking layer with the buffer layer intervening.