Patent ID: 6961359
Filing Date: 2005-11-01
Classification: H01S

Abstract:
1. A semiconductor laser device of ridge waveguide type comprising: a substrate; a resonator structure operatively formed on the substrate to generate a laser light and having upper and lower cladding layers and an active layer between the cladding layers; a ridge formed in an upper portion of at least the upper cladding layer; a stacked film comprising an insulating film that is substantially transmissive of the laser light and an absorption film that absorbs the laser light and that is formed on the insulating; and an electrode film, wherein, the stacked film is formed on both sides of the ridge and on those portions of the upper cladding layer extending sideward from the base of the ridge, the electrode film formed over the stacked film and is electrically connected to an upper surface of the ridge through a window in the stacked film, and the insulating film and the absorption film have respective thicknesses such that the absorption coefficient of high-order horizontal lateral mode is larger than the absorption coefficient of fundamental horizontal lateral mode, wherein, the insulating film is any of an SiO