Patent ID: 7768683
Filing Date: 2010-08-03
Classification: G02B

Abstract:
1. A method to align a spatial light modulator disposed in a holographic data storage system, comprising the steps of: supplying a holographic data storage system comprising a light source, a stored write reference orientation image, a tangential matched filter, a first rotated matched filter, a second rotated matched filter and an optical detector; providing a holographic data storage medium encoded with said write reference orientation image; providing a reference beam; establishing a write threshold correlation factor; illuminating said encoded holographic data storage medium with said reference beam to generate a write channel alignment data beam comprising a projected write reference orientation image; projecting said write channel alignment data beam onto said optical detector; calculating a first write correlation factor using said projected write reference orientation image, said stored write reference orientation image, and said tangential matched filter; determining if said first write correlation factor is greater than or equal to said write threshold correlation factor.