What is a Hologram?
Holography is the Nobel award-winning science of recording the light waves emitted from a laser as they are reflected off of an object. The recorded image is called a hologram (coming from Greek words meaning ‘whole image’ or ‘entire recording’). When re-illuminated and viewed under ordinary light, the hologram presents a true three dimensional recreation of the original object. For the observer, the perception of depth is virtually indistinguishable from reality.
A. From Webster’s: “a three-dimensional picture that is made on a photographic film or plate without theuse of a camera, that consists of a pattern of interference produced by a split coherent beam of light, andthat for viewing is illuminated with coherent light from behind.” What does this mean, a hologram is usuallyprinted on some type of silver foil and the image appears to have layers which move in relation to each other as the viewing angle is changed. Holograms are used as a security device on stamps, credit cards and many other valuables, because they are not easy or cheap to reproduce.
