Optical holography[1] is a technique which enables an optical 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.
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 it onto a suitable mask or film and illuminated by a suitable source to reconstruct the wavefront of interest.
^Hariharan, P. (1996). Optical Holography. Cambridge: Cambridge University Press. ISBN 9780521433488.
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Opticalholography is a technique which enables an optical wavefront to be recorded and later re-constructed. Holography is best known as a method of...
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