摘要 |
PURPOSE:To provide an optical pickup for exactly controlling the quantity of light of semiconductor laser with a structure to use a hologram. CONSTITUTION:A reflected hologram area 13a is formed at a hologram 13a so as to reflect forward emitted light from a semiconductor laser 11 and to converge it on a photodetector area 16b for output monitor of a photodetector 16. Then, the photodetector area 16a for output monitor and a photodetector area 16a for signal detection to receive reflected light from an optical disk 15 are monolithically integrated. |