| 摘要 |
PURPOSE:To provide the optical integrated circuit which can be improved in light utilization efficiency, the optical pickup where the optical integrated circuit is mounted, and the optical information processor. CONSTITUTION:The light which is projected into a transparent substrate 30 from a laser element 31 is distributed by a diffraction grating 32 for three-beam generation as three light beams which are a diffracted light beam of 0th order and diffracted light beams of + or -1st order. Then the diffracted light is passed through a total reflecting mirror 33, a hologram collimator lens 34, and an aspherical objective 35 and converged to irradiate an optical disk 49. The return light from the optical disk 49, on the other hand, travels back along the optical path and returns to the spherical objective 35 and hologram collimator lens 34, where the light is branched as diffracted light of 1st order in a direction different from the light traveling to the optical disk 49 and then reflected by total reflecting mirrors 46, 33, and 36, so that the light is detected by a multidivision photodetecting element 44. |
