Holography is a technique that enables a wavefront to be recorded and later re-constructed. Holography is best known as a method of generating three-dimensional images, but it also has a wide range of other applications. In principle, it is possible to make a hologram for any type of wave.
A hologram is made by superimposing a second wavefront (normally called the reference beam) on the wavefront of interest, thereby generating an interference pattern which is recorded on a physical medium. When only the second wavefront illuminates the interference pattern, it is diffracted to recreate the original wavefront. Holograms can also be computer-generated by modelling the two wavefronts and adding them together digitally. The resulting digital image is then printed onto a suitable mask or film and illuminated by a suitable source to reconstruct the wavefront of interest.
Lists containing Holograms :
25 Best Inventions of 20th Century
The Best Inventions of the 20th Century: During the hundred years of the 20th century, technology, science, invention and re-invention progressed at an accelerated pace than in any other century. We started the 20th century with the infancy of the airplane, the automobile, and the radio, when those inventions amazed us with their novelty and…