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A signal beam or object beam is one of at least two laser beams used to write holograms. The signal beam is the beam that carries the information to be stored in the hologram. In the case of a holographic picture, this beam is reflected off the object being recorded, into the media. In the case of holographic data storage, the beam has some kind information encoded into it (for instance, it can be sent through a transparency or a spatial light modulator).
Additional recommended knowledge
The other beam necessary to write a hologram is the reference beam.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Signal_beam". A list of authors is available in Wikipedia.|