Servoing system for multiple spot registration for holographic replication system

摘要

The present techniques provide methods and systems for controlling the recording of micro-holograms 68 using multiple counter-propagating light beams over multiple data tracks 12 of a holographic disk 10. Imperfections in a holographic disk 10 or movement of the disk during a recording process may cause signal beams to deviate from target data tracks. In some embodiments, a tracking beam 22 is directed to a reference layer 78 in the disk. Deviation of the reference beam 66 from a target groove in the reference layer 78 may be indicative of tracking errors. A detector may detect reflections of the tracking beam 22 and generate an error signal in response to detected tracking errors. Servo-mechanical devices 28 may actuate (e.g., radially, tangentially, or axially translate, rotate, and/or tilt) one or more optical components through which the counter-propagating light beams are emitted to compensate for tracking errors.