HOLOGRAPHIC STORAGE SYSTEM FOR READING A HOLOGRAM STORED ON A HOLOGRAPHIC STORAGE MEDIUM AND A METHOD CARRIED OUT THEREWITH

摘要

The invention relates to a holographic storage system (1) for reading a hologram (7) stored on a holographic storage medium (6). The system (1) comprises: storage medium holding means arranged along an optical path of a reference beam (3); a spatial light modulator (SLM) (4) arranged along said optical path for encoding a reference beam (3) with a code pattern (15); a detector (5) for detecting an image of the reconstructed hologram (7); and a servo control unit (14) for determining a misalignment of said reference beam (3) and said storage medium (6) from the detected image and for acting upon said SLM (4) to shift said code pattern (15). The invention further relates to a method of reading a hologram (7) stored on a holographic storage medium (6) comprising the steps of: a) encoding a reference beam (3) with a code pattern (15) created by a spatial light modulator (SLM (4)); b) detecting an image of the reconstructed hologram; c) determining a misalignment of said reference beam (3) and said storage medium (6) from the detected image; and d) shifting said code pattern (15) on the SLM (4) based at least in part on said misalignment.