Patent ID: 6856636
Filing Date: 2005-02-15
Classification: H01S

Abstract:
1. A semiconductor laser device comprising: a GaAs substrate of a first conductive type; a lower cladding layer of said first conductive type, the lower cladding layer being formed on said GaAs substrate; a lower optical waveguide layer of said first conductive type or an undoped type made of InGaP, the lower optical waveguide layer being lattice-matched with said GaAs substrate and formed on said lower cladding layer; an active layer made of In an upper first optical waveguide layer of a second conductive type or an undoped type made of InGaP, the upper first optical waveguide layer being lattice-matched with said GaAs substrate and formed on said active layer; a current confinement layer of a first conductive type made of In an upper second optical waveguide layer of the second conductive type formed so as to bury said opening, the upper second optical waveguide layer being formed on said current confinement layer; an upper cladding layer of the second conductive type, the upper cladding layer being formed on said upper second optical waveguide layer; a GaAs contact layer of the second conductive type, the GaAs contact layer being formed on said upper cladding layer; an electrode formed on said GaAs contact layer; and resonator facets formed of two opposite facets, wherein a current injection control structure that controls a current injection to said active layer is provided in the vicinity of at least one of said facets.