Patent ID: 6400743
Filing Date: 2002-06-04
Classification: B82Y,H01S

Abstract:
A semiconductor laser device comprising:a GaAs substrate of a first conductive type; a lower cladding layer of said first conductive type, formed on said GaAs substrate; a lower optical waveguide layer formed on said lower cladding layer; a compressive strain quantum well active layer made of Inx3Ga1-x3As1-y3Py3, and formed on said lower optical waveguide layer, where 03&lE;0.4, 0&lE;y3&lE;0.1, and an absolute value of a first product of a strain and a thickness of said compressive strain quantum well active layer is equal to or smaller than 0.25 nm; an upper optical waveguide layer formed on said Inx3Ga1-x3As1-y3Py3 compressive strain quantum well active layer; a first upper cladding layer made of In0.49Ga0.51P of a second conductive type, and formed on said upper optical waveguide layer; an etching stop layer made of Inx1Ga1-x1As1-y1Py1, and formed on said first upper cladding layer other than a stripe area of said first upper cladding layer so as to form a first portion of a stripe groove realizing a current injection window, where 0&lE;x1&lE;0.3, 0&lE;y1&lE;0.6, and an absolute value of a second product of a strain and a thickness of said etching stop layer is equal to or smaller than 0.25 nm; a current confinement layer made of In0.49Ga0.51P of said first conductive type, and formed on said etching stop layer so as to form a second portion of said stripe groove; a second upper cladding layer made of Inx4Ga1-x4As1-y4Py4 of said second conductive type, and formed on said current confinement layer and said stripe area of the first upper cladding layer, where x4=(0.49Â±0.01)y4 and 0.4&lE;x4&lE;0.46; and a contact layer of said second conductive type, formed on said second upper cladding layer; wherein each of said lower cladding layer, said lower optical waveguide layer, said upper optical waveguide layer, said first upper cladding layer, said current confinement layer, said second upper cladding layer, and said contact layer has such a composition as to lattice-match with said GaAs substrate.