| 摘要 |
An optical pickup system for regenerating information stored on a hologram disk including a pair of recording surfaces thereon, includes a first and a second light sources, an optical detection unit having a first and a second detectors, a diffraction device including a crystal base, a first and a second diffraction elements, a beam splitter, disposed between the first detector and the hologram disk, an objective lens, disposed between the beam splitter and the hologram disk, and a signal detection unit having a first and a second signal detection circuits, wherein the second light source is used for reproducing a regenerated information signal on the second recording surface of the hologram disk and the first light source is used for detecting a tracking error and a focusing error off the first recording surface of the hologram disk.
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