| 摘要 |
<p>Digital data bits are stored at storage locations at plural depths within a holographic storage medium (22) as selective, localized alterations in a format hologram (52). Micro-localized regions of a reflection format hologram extending throughout the medium are detected by focusing a high-power laser beam at desired storage locations (30a). The deletion regions have a lower power reflectivity than the surrounding parts of the format hologram. Tunable-focus storage and retrieval heads (11), as well as dynamic aberration compensators (39), are used for multi-depth access. Storage and retrieval may each be achieved with a single head.</p> |
