HOLOGRAPHY MEMORY WITH ZERO-ORDER DIFFRACTION LIGHT REMOVED

摘要

A holography memory apparatus has parallel prisms disposed between the hologram plate and the photosensitive array. A light beam is diffracted at the hologram plate as a coherent light beam and is incident on the hologram plate for holographic image reconstruction and is then passed through the prism. As a result, the zero-order diffraction light pattern is removed, thus preventing it from reaching the photo-sensitive array. Hence, evidently, the photo-sensitive array can be perfectly protected from destruction attributable to the zero-order diffraction light pattern.