Patent ID: 6813290
Filing Date: 2004-11-02
Classification: H01S

Abstract:
A semiconductor laser device comprising:an etching control layer, which is formed on a first region of a compound semiconductor substrate and has a composition different from a composition of the substrate; a first semiconductor laser structure, which is defined over the etching control layer and which is made up of a first multiple semiconductor layers including a first active layer with a composition different from that of the etching control layer; and a second semiconductor laser structure, which is defined on a second region of the substrate and which is made up of a second multiple semiconductor layers including a second active layer, wherein no part of the etching control layer exists between the second region of the substrate and the second semiconductor laser structure, wherein the first multiple semiconductor layers are made of III-V compound, the V element is one selected from the group consisting of As and P, wherein the second multiple semiconductor layers are made of III-V compound, the V element is another selected from the group consisting of As and P, and wherein the etching control layer has a V element different from the V element comprising of the first multiple semiconductor layers.