Patent ID: 6795469
Filing Date: 2004-09-21
Classification: B82Y,H01S

Abstract:
A semiconductor laser element comprising:a substrate of GaAs of a first conductive type; a lower cladding layer of the first conductive type, formed above said GaAs substrate; a lower optical waveguide layer of the first conductive type or an undoped type, formed above said lower cladding layer; a lower GaAs layer, formed above said lower optical waveguide layer; an active layer of Inx1Ga1-x1As1-y1Py1 where 0.49y1an upper GaAs layer, formed above said active layer; an upper optical waveguide layer of a second conductive type or an undoped type, formed above said upper GaAs layer; an upper cladding layer of the second conductive type, formed above said upper optical waveguide layer; and a contact layer of the second conductive type, formed above said upper cladding layer; a bandgap energy of said upper and lower optical waveguide layers being greater than a bandgap energy of said active layer; wherein said upper GaAs layer, said active layer and at least a portion of said lower GaAs layer are formed in regions excluding at least the vicinities of emission end facets of a resonator, and end portions of said upper optical waveguide layer are formed so that they fill in said vicinity of the emission end facets.