What Does Hologram Mean?
A hologram is a recording of light wave interference patterns that can be played back to create a high-resolution image in full color and three dimensions. Unlike the stereoscopic technologies used to create 3-D experiences today, holograms do not require special glasses.
In principle, it is possible to make a hologram for any type of waveform. Because holography can record interference waves for matter, for example, some types of holograms allow people to interact with computer-generated objects as if they were real.
In 1951 Dr. Dennis Gabor won the Nobel Prize for inventing and developing the holographic method after he discovered a way to produce images that had the illusion of depth. Dr. Gabor's method was based on his observations about the interaction between light waves (interference) and how light waves align in phase with one another (coherence).
Although, Gabor figured out how to record the interference pattern between a coherent electron beam (object wave) and a coherent background (reference wave) on a photographic plate, conventional light sources at the time provided either too little light or light that was too diffuse. Holography did not become a commercial technology until after 1960's, when lasers capable of amplifying light wave intensity became available.