Patent ID: 7713856

Claim:
A method of producing a semiconductor laser comprising a first part in the form of a narrow monomode stripe terminating in a second part flaring out from the first part, the multilayer structure of this laser being of the type with separate confinements in a plane perpendicular to the plane of the layers and including an active layer with at least one quantum well, comprising the following steps: epitaxial growth of the substrate and the layers of the multilayer structure; deposition of a first ohmic contact on the upper layer of said structure; photolithography and etching of two trenches defining between them said first and second parts of the laser; deposition of a second ohmic contact on the underside of the substrate; deposition of a polymer in the trenches; photolithography on the upper face of the first ohmic contact leaving photoresist to remain on top of a zone lying between the two trenches; proton implantation through the layer of the contact, the photoresist layer preventing implantation in the zone that it covers; and deposition of an electrode on the upper face of the assembly.