Patent ID: 7197057

Claim:
A semiconductor laser device comprising: a semiconductor substrate having a first surface and a second surface that are opposite to one another; a first conductive type clad formed on the first surface of the semiconductor substrate; an active layer formed on the first conductive type clad; an etch stop layer formed on the active layer; a current blocking layer formed in a V-groove shape so that a part of the etch stop layer is exposed; a second conductive type clad formed entirely over the V-groove and the current blocking layer; an optical guide layer formed on the second conductive type clad, wherein the optical guide layer is formed to be thicker in the V-groove than in the surrounding part; a current pass facilitation layer; a cap layer formed on the current pass facilitation layer; a second conductive type electrode formed on the cap layer; and a first conductive type electrode formed on the second surface of the semiconductor substrate.