Patent ID: 6600770
Filing Date: 2003-07-29
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 Inx3Ga1âˆ’x3As1âˆ’y3Py3, and formed on said lower optical waveguide layer, where 0an upper optical waveguide layer formed on said compressive strain quantum well active layer; a first etching stop layer made of Inx6Ga1âˆ’x6P of a second conductive type, and formed on said upper optical waveguide layer, where 0&lE;x6&lE;1; a second etching stop layer made of Inx1Ga1âˆ’x1As1âˆ’y1Py1 of said second conductive type, and formed on said first etching stop layer other than a stripe area of said first etching stop layer so as to form a first portion of a stripe groove realizing a current injection window, where 0&lE;x1&lE;0.4, and 0&lE;y1&lE;0.5; a first InxGa1âˆ’xP layer of said second conductive type, and formed on said second etching stop layer so as to form a second portion of said stripe groove, where x=0.49Â±0.01; a current confinement layer made of InxGa1âˆ’xP of said first conductive type, and formed on said first InxGa1âˆ’xP layer so as to form a third portion of said stripe groove; an upper cladding layer made of Inx4Ga1âˆ’x4As1âˆ’y4Py4 of said second conductive type, and formed over said current confinement layer and said stripe groove, where x4=0.49y4Â±0.01, and xâˆ’0.04&lE;x4&lE;xâˆ’0.01; and a contact layer of said second conductive type, formed on said upper cladding layer; wherein each of layers constituting said semiconductor laser device other than the compressive strain quantum well active layer and the first and second etching stop layers has such a composition as to lattice-match with GaAs.