Holographic storage system using homodyne detection

摘要

The present invention relates to an apparatus (1) for reading from holographic storage media (13) using a homodyne detection scheme.;According to the invention, the apparatus (1) for reading from a holographic storage medium (13), with a light source (2') for generating a reference beam (5) and a local oscillator beam (20), and an objective lens (12) for focusing the reference beam (5) into the holographic storage medium in order to generate a reconstructed object beam (14). The coherence length of the reference beam (5) and the local oscillator beam (20) is shorter than twice the distance between the objective lens (12) and the holographic storage medium (13).