Patent ID: 7666694
Filing Date: 2010-02-23
Classification: B82Y,H01S

Abstract:
1. A method for manufacturing a semiconductor laser device, comprising: forming a diffraction grating on a surface of a semiconductor substrate or on a film on the surface of said semiconductor substrate so that a width of said diffraction grating in a direction that is orthogonal to a cavity direction of said semiconductor laser device is a width equal to or longer than a sum of a mesa width and 30 μm; forming a multiple-layered film on a surface of said diffraction grating; and forming the mesa parallel to the cavity direction by partially removing said multiple-layered film and partially removing said diffraction grating so that at least a substantially-central portion of said diffraction grating is remained, after said forming said multiple-layered film, wherein said forming the multiple-layered film includes forming an active layer on the whole surface of said diffraction grating.