| 摘要 |
PURPOSE:To provide an integrated type optical pickup easy to manufacure, of a low cost and supplying an excellent output signal with high S/N. CONSTITUTION:In a grating layer 12 formed on an optical waveguide layer 1, one part of the surface of the optical waveguide layer of an area where grating elements 3, 5 are not present, that is, the area where a laser beam outgoing from a semiconductor laser 2 waveguides is eliminated by etching, etc. At this time, the grating layer 12 is remained in the area 20 where a photodetector 6 is present. |
