摘要 |
Provided are a photo detecting device and a holographic data reproducing apparatus for a multilayered holographic data storage medium using the photo detecting device. The holographic data reproducing apparatus, which can reproduce a large amount of information recorded in multiple layers of a holographic data storage medium, includes a focusing lens focusing a plurality reproducing signal beams generated when a reference beam is incident on the holographic data storage medium and having focal points formed at different locations on the same optical axis, a volume hologram device generating secondary signal beams which travel in different directions by diffracting a plurality of reproducing signal beams having different focal points, a fourier lens focusing the secondary signal beams generated from the volume hologram device, and an optical detector array detecting the secondary signal beams focused by the fourier lens.
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