Collinear Holographic Memory

 Hologram memory has a potential for realizing a high data transfer rate and a large data capacity due to the processing two-dimensional data pages and the multiplexing holograms.

 Fig.1 shows principle of the collinear holography. In this method, the signal light (circle) and the reference light (outer circle) are generated by a spatial light modulator (SLM). This method has the following advantages. There is no movable part and it stabilizes mechanically. The influence by the vibration is a little because the signal light and the reference light are arranged in the same axle.
Fig. 1 Record and read out principle of the collinear holography (a)record, (b)read out