Replication and recording method for bit-wise holographic storage

摘要

The present techniques provide methods and systems for recording micro-holograms (68) on a holographic disk (10) using a plurality of counter-propagating light beams (30, 34) in parallel. The parallel counter-propagating light beams (30, 34) overlap to form interference patterns on a data layer and over multiple data tracks (12) in the holographic disk (10). Rotating the disk (10) enables the parallel recording of micro-holograms (68) over multiple data tracks (12), thus reducing recording time. Further, the illumination pattern may include illuminated spots and non-illuminated regions, such that each illumination spot may cover a relatively small fraction of the data layer plane, possibly controlling the depth spread of the recorded micro-hologram (12). In some embodiments, data in the parallel signal beams (60) may be retrieved from a master holographic disk (46) or may be modulated (24) into the parallel signal beams (60).