Collinear Holographic Memory

"Abstract"
 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.

"Collinear"
 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.
(a)
(b)
Fig. 1 Record and read out principle of the collinear holography (a)record, (b)read out